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(module, exports) {\n  'use strict';\n\n  // Utils\n  function assert(val, msg) {\n    if (!val) throw new Error(msg || 'Assertion failed');\n  }\n\n  // Could use `inherits` module, but don't want to move from single file\n  // architecture yet.\n  function inherits(ctor, superCtor) {\n    ctor.super_ = superCtor;\n    var TempCtor = function () {};\n    TempCtor.prototype = superCtor.prototype;\n    ctor.prototype = new TempCtor();\n    ctor.prototype.constructor = ctor;\n  }\n\n  // BN\n\n  function BN(number, base, endian) {\n    if (BN.isBN(number)) {\n      return number;\n    }\n    this.negative = 0;\n    this.words = null;\n    this.length = 0;\n\n    // Reduction context\n    this.red = null;\n    if (number !== null) {\n      if (base === 'le' || base === 'be') {\n        endian = base;\n        base = 10;\n      }\n      this._init(number || 0, base || 10, endian || 'be');\n    }\n  }\n  if (typeof module === 'object') {\n    module.exports = BN;\n  } else {\n    exports.BN = BN;\n  }\n  BN.BN = BN;\n  BN.wordSize = 26;\n  var Buffer;\n  try {\n    if (typeof window !== 'undefined' && typeof window.Buffer !== 'undefined') {\n      Buffer = window.Buffer;\n    } else {\n      Buffer = require('buffer').Buffer;\n    }\n  } catch (e) {}\n  BN.isBN = function isBN(num) {\n    if (num instanceof BN) {\n      return true;\n    }\n    return num !== null && typeof num === 'object' && num.constructor.wordSize === BN.wordSize && Array.isArray(num.words);\n  };\n  BN.max = function max(left, right) {\n    if (left.cmp(right) > 0) return left;\n    return right;\n  };\n  BN.min = function min(left, right) {\n    if (left.cmp(right) < 0) return left;\n    return right;\n  };\n  BN.prototype._init = function init(number, base, endian) {\n    if (typeof number === 'number') {\n      return this._initNumber(number, base, endian);\n    }\n    if (typeof number === 'object') {\n      return this._initArray(number, base, endian);\n    }\n    if (base === 'hex') {\n      base = 16;\n    }\n    assert(base === (base | 0) && base >= 2 && base <= 36);\n    number = number.toString().replace(/\\s+/g, '');\n    var start = 0;\n    if (number[0] === '-') {\n      start++;\n      this.negative = 1;\n    }\n    if (start < number.length) {\n      if (base === 16) {\n        this._parseHex(number, start, endian);\n      } else {\n        this._parseBase(number, base, start);\n        if (endian === 'le') {\n          this._initArray(this.toArray(), base, endian);\n        }\n      }\n    }\n  };\n  BN.prototype._initNumber = function _initNumber(number, base, endian) {\n    if (number < 0) {\n      this.negative = 1;\n      number = -number;\n    }\n    if (number < 0x4000000) {\n      this.words = [number & 0x3ffffff];\n      this.length = 1;\n    } else if (number < 0x10000000000000) {\n      this.words = [number & 0x3ffffff, number / 0x4000000 & 0x3ffffff];\n      this.length = 2;\n    } else {\n      assert(number < 0x20000000000000); // 2 ^ 53 (unsafe)\n      this.words = [number & 0x3ffffff, number / 0x4000000 & 0x3ffffff, 1];\n      this.length = 3;\n    }\n    if (endian !== 'le') return;\n\n    // Reverse the bytes\n    this._initArray(this.toArray(), base, endian);\n  };\n  BN.prototype._initArray = function _initArray(number, base, endian) {\n    // Perhaps a Uint8Array\n    assert(typeof number.length === 'number');\n    if (number.length <= 0) {\n      this.words = [0];\n      this.length = 1;\n      return this;\n    }\n    this.length = Math.ceil(number.length / 3);\n    this.words = new Array(this.length);\n    for (var i = 0; i < this.length; i++) {\n      this.words[i] = 0;\n    }\n    var j, w;\n    var off = 0;\n    if (endian === 'be') {\n      for (i = number.length - 1, j = 0; i >= 0; i -= 3) {\n        w = number[i] | number[i - 1] << 8 | number[i - 2] << 16;\n        this.words[j] |= w << off & 0x3ffffff;\n        this.words[j + 1] = w >>> 26 - off & 0x3ffffff;\n        off += 24;\n        if (off >= 26) {\n          off -= 26;\n          j++;\n        }\n      }\n    } else if (endian === 'le') {\n      for (i = 0, j = 0; i < number.length; i += 3) {\n        w = number[i] | number[i + 1] << 8 | number[i + 2] << 16;\n        this.words[j] |= w << off & 0x3ffffff;\n        this.words[j + 1] = w >>> 26 - off & 0x3ffffff;\n        off += 24;\n        if (off >= 26) {\n          off -= 26;\n          j++;\n        }\n      }\n    }\n    return this.strip();\n  };\n  function parseHex4Bits(string, index) {\n    var c = string.charCodeAt(index);\n    // 'A' - 'F'\n    if (c >= 65 && c <= 70) {\n      return c - 55;\n      // 'a' - 'f'\n    } else if (c >= 97 && c <= 102) {\n      return c - 87;\n      // '0' - '9'\n    } else {\n      return c - 48 & 0xf;\n    }\n  }\n  function parseHexByte(string, lowerBound, index) {\n    var r = parseHex4Bits(string, index);\n    if (index - 1 >= lowerBound) {\n      r |= parseHex4Bits(string, index - 1) << 4;\n    }\n    return r;\n  }\n  BN.prototype._parseHex = function _parseHex(number, start, endian) {\n    // Create possibly bigger array to ensure that it fits the number\n    this.length = Math.ceil((number.length - start) / 6);\n    this.words = new Array(this.length);\n    for (var i = 0; i < this.length; i++) {\n      this.words[i] = 0;\n    }\n\n    // 24-bits chunks\n    var off = 0;\n    var j = 0;\n    var w;\n    if (endian === 'be') {\n      for (i = number.length - 1; i >= start; i -= 2) {\n        w = parseHexByte(number, start, i) << off;\n        this.words[j] |= w & 0x3ffffff;\n        if (off >= 18) {\n          off -= 18;\n          j += 1;\n          this.words[j] |= w >>> 26;\n        } else {\n          off += 8;\n        }\n      }\n    } else {\n      var parseLength = number.length - start;\n      for (i = parseLength % 2 === 0 ? start + 1 : start; i < number.length; i += 2) {\n        w = parseHexByte(number, start, i) << off;\n        this.words[j] |= w & 0x3ffffff;\n        if (off >= 18) {\n          off -= 18;\n          j += 1;\n          this.words[j] |= w >>> 26;\n        } else {\n          off += 8;\n        }\n      }\n    }\n    this.strip();\n  };\n  function parseBase(str, start, end, mul) {\n    var r = 0;\n    var len = Math.min(str.length, end);\n    for (var i = start; i < len; i++) {\n      var c = str.charCodeAt(i) - 48;\n      r *= mul;\n\n      // 'a'\n      if (c >= 49) {\n        r += c - 49 + 0xa;\n\n        // 'A'\n      } else if (c >= 17) {\n        r += c - 17 + 0xa;\n\n        // '0' - '9'\n      } else {\n        r += c;\n      }\n    }\n    return r;\n  }\n  BN.prototype._parseBase = function _parseBase(number, base, start) {\n    // Initialize as zero\n    this.words = [0];\n    this.length = 1;\n\n    // Find length of limb in base\n    for (var limbLen = 0, limbPow = 1; limbPow <= 0x3ffffff; limbPow *= base) {\n      limbLen++;\n    }\n    limbLen--;\n    limbPow = limbPow / base | 0;\n    var total = number.length - start;\n    var mod = total % limbLen;\n    var end = Math.min(total, total - mod) + start;\n    var word = 0;\n    for (var i = start; i < end; i += limbLen) {\n      word = parseBase(number, i, i + limbLen, base);\n      this.imuln(limbPow);\n      if (this.words[0] + word < 0x4000000) {\n        this.words[0] += word;\n      } else {\n        this._iaddn(word);\n      }\n    }\n    if (mod !== 0) {\n      var pow = 1;\n      word = parseBase(number, i, number.length, base);\n      for (i = 0; i < mod; i++) {\n        pow *= base;\n      }\n      this.imuln(pow);\n      if (this.words[0] + word < 0x4000000) {\n        this.words[0] += word;\n      } else {\n        this._iaddn(word);\n      }\n    }\n    this.strip();\n  };\n  BN.prototype.copy = function copy(dest) {\n    dest.words = new Array(this.length);\n    for (var i = 0; i < this.length; i++) {\n      dest.words[i] = this.words[i];\n    }\n    dest.length = this.length;\n    dest.negative = this.negative;\n    dest.red = this.red;\n  };\n  BN.prototype.clone = function clone() {\n    var r = new BN(null);\n    this.copy(r);\n    return r;\n  };\n  BN.prototype._expand = function _expand(size) {\n    while (this.length < size) {\n      this.words[this.length++] = 0;\n    }\n    return this;\n  };\n\n  // Remove leading `0` from `this`\n  BN.prototype.strip = function strip() {\n    while (this.length > 1 && this.words[this.length - 1] === 0) {\n      this.length--;\n    }\n    return this._normSign();\n  };\n  BN.prototype._normSign = function _normSign() {\n    // -0 = 0\n    if (this.length === 1 && this.words[0] === 0) {\n      this.negative = 0;\n    }\n    return this;\n  };\n  BN.prototype.inspect = function inspect() {\n    return (this.red ? '<BN-R: ' : '<BN: ') + this.toString(16) + '>';\n  };\n\n  /*\n   var zeros = [];\n  var groupSizes = [];\n  var groupBases = [];\n   var s = '';\n  var i = -1;\n  while (++i < BN.wordSize) {\n    zeros[i] = s;\n    s += '0';\n  }\n  groupSizes[0] = 0;\n  groupSizes[1] = 0;\n  groupBases[0] = 0;\n  groupBases[1] = 0;\n  var base = 2 - 1;\n  while (++base < 36 + 1) {\n    var groupSize = 0;\n    var groupBase = 1;\n    while (groupBase < (1 << BN.wordSize) / base) {\n      groupBase *= base;\n      groupSize += 1;\n    }\n    groupSizes[base] = groupSize;\n    groupBases[base] = groupBase;\n  }\n   */\n\n  var zeros = ['', '0', '00', '000', '0000', '00000', '000000', '0000000', '00000000', '000000000', '0000000000', '00000000000', '000000000000', '0000000000000', '00000000000000', '000000000000000', '0000000000000000', '00000000000000000', '000000000000000000', '0000000000000000000', '00000000000000000000', '000000000000000000000', '0000000000000000000000', '00000000000000000000000', '000000000000000000000000', '0000000000000000000000000'];\n  var groupSizes = [0, 0, 25, 16, 12, 11, 10, 9, 8, 8, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5];\n  var groupBases = [0, 0, 33554432, 43046721, 16777216, 48828125, 60466176, 40353607, 16777216, 43046721, 10000000, 19487171, 35831808, 62748517, 7529536, 11390625, 16777216, 24137569, 34012224, 47045881, 64000000, 4084101, 5153632, 6436343, 7962624, 9765625, 11881376, 14348907, 17210368, 20511149, 24300000, 28629151, 33554432, 39135393, 45435424, 52521875, 60466176];\n  BN.prototype.toString = function toString(base, padding) {\n    base = base || 10;\n    padding = padding | 0 || 1;\n    var out;\n    if (base === 16 || base === 'hex') {\n      out = '';\n      var off = 0;\n      var carry = 0;\n      for (var i = 0; i < this.length; i++) {\n        var w = this.words[i];\n        var word = ((w << off | carry) & 0xffffff).toString(16);\n        carry = w >>> 24 - off & 0xffffff;\n        if (carry !== 0 || i !== this.length - 1) {\n          out = zeros[6 - word.length] + word + out;\n        } else {\n          out = word + out;\n        }\n        off += 2;\n        if (off >= 26) {\n          off -= 26;\n          i--;\n        }\n      }\n      if (carry !== 0) {\n        out = carry.toString(16) + out;\n      }\n      while (out.length % padding !== 0) {\n        out = '0' + out;\n      }\n      if (this.negative !== 0) {\n        out = '-' + out;\n      }\n      return out;\n    }\n    if (base === (base | 0) && base >= 2 && base <= 36) {\n      // var groupSize = Math.floor(BN.wordSize * Math.LN2 / Math.log(base));\n      var groupSize = groupSizes[base];\n      // var groupBase = Math.pow(base, groupSize);\n      var groupBase = groupBases[base];\n      out = '';\n      var c = this.clone();\n      c.negative = 0;\n      while (!c.isZero()) {\n        var r = c.modn(groupBase).toString(base);\n        c = c.idivn(groupBase);\n        if (!c.isZero()) {\n          out = zeros[groupSize - r.length] + r + out;\n        } else {\n          out = r + out;\n        }\n      }\n      if (this.isZero()) {\n        out = '0' + out;\n      }\n      while (out.length % padding !== 0) {\n        out = '0' + out;\n      }\n      if (this.negative !== 0) {\n        out = '-' + out;\n      }\n      return out;\n    }\n    assert(false, 'Base should be between 2 and 36');\n  };\n  BN.prototype.toNumber = function toNumber() {\n    var ret = this.words[0];\n    if (this.length === 2) {\n      ret += this.words[1] * 0x4000000;\n    } else if (this.length === 3 && this.words[2] === 0x01) {\n      // NOTE: at this stage it is known that the top bit is set\n      ret += 0x10000000000000 + this.words[1] * 0x4000000;\n    } else if (this.length > 2) {\n      assert(false, 'Number can only safely store up to 53 bits');\n    }\n    return this.negative !== 0 ? -ret : ret;\n  };\n  BN.prototype.toJSON = function toJSON() {\n    return this.toString(16);\n  };\n  BN.prototype.toBuffer = function toBuffer(endian, length) {\n    assert(typeof Buffer !== 'undefined');\n    return this.toArrayLike(Buffer, endian, length);\n  };\n  BN.prototype.toArray = function toArray(endian, length) {\n    return this.toArrayLike(Array, endian, length);\n  };\n  BN.prototype.toArrayLike = function toArrayLike(ArrayType, endian, length) {\n    var byteLength = this.byteLength();\n    var reqLength = length || Math.max(1, byteLength);\n    assert(byteLength <= reqLength, 'byte array longer than desired length');\n    assert(reqLength > 0, 'Requested array length <= 0');\n    this.strip();\n    var littleEndian = endian === 'le';\n    var res = new ArrayType(reqLength);\n    var b, i;\n    var q = this.clone();\n    if (!littleEndian) {\n      // Assume big-endian\n      for (i = 0; i < reqLength - byteLength; i++) {\n        res[i] = 0;\n      }\n      for (i = 0; !q.isZero(); i++) {\n        b = q.andln(0xff);\n        q.iushrn(8);\n        res[reqLength - i - 1] = b;\n      }\n    } else {\n      for (i = 0; !q.isZero(); i++) {\n        b = q.andln(0xff);\n        q.iushrn(8);\n        res[i] = b;\n      }\n      for (; i < reqLength; i++) {\n        res[i] = 0;\n      }\n    }\n    return res;\n  };\n  if (Math.clz32) {\n    BN.prototype._countBits = function _countBits(w) {\n      return 32 - Math.clz32(w);\n    };\n  } else {\n    BN.prototype._countBits = function _countBits(w) {\n      var t = w;\n      var r = 0;\n      if (t >= 0x1000) {\n        r += 13;\n        t >>>= 13;\n      }\n      if (t >= 0x40) {\n        r += 7;\n        t >>>= 7;\n      }\n      if (t >= 0x8) {\n        r += 4;\n        t >>>= 4;\n      }\n      if (t >= 0x02) {\n        r += 2;\n        t >>>= 2;\n      }\n      return r + t;\n    };\n  }\n  BN.prototype._zeroBits = function _zeroBits(w) {\n    // Short-cut\n    if (w === 0) return 26;\n    var t = w;\n    var r = 0;\n    if ((t & 0x1fff) === 0) {\n      r += 13;\n      t >>>= 13;\n    }\n    if ((t & 0x7f) === 0) {\n      r += 7;\n      t >>>= 7;\n    }\n    if ((t & 0xf) === 0) {\n      r += 4;\n      t >>>= 4;\n    }\n    if ((t & 0x3) === 0) {\n      r += 2;\n      t >>>= 2;\n    }\n    if ((t & 0x1) === 0) {\n      r++;\n    }\n    return r;\n  };\n\n  // Return number of used bits in a BN\n  BN.prototype.bitLength = function bitLength() {\n    var w = this.words[this.length - 1];\n    var hi = this._countBits(w);\n    return (this.length - 1) * 26 + hi;\n  };\n  function toBitArray(num) {\n    var w = new Array(num.bitLength());\n    for (var bit = 0; bit < w.length; bit++) {\n      var off = bit / 26 | 0;\n      var wbit = bit % 26;\n      w[bit] = (num.words[off] & 1 << wbit) >>> wbit;\n    }\n    return w;\n  }\n\n  // Number of trailing zero bits\n  BN.prototype.zeroBits = function zeroBits() {\n    if (this.isZero()) return 0;\n    var r = 0;\n    for (var i = 0; i < this.length; i++) {\n      var b = this._zeroBits(this.words[i]);\n      r += b;\n      if (b !== 26) break;\n    }\n    return r;\n  };\n  BN.prototype.byteLength = function byteLength() {\n    return Math.ceil(this.bitLength() / 8);\n  };\n  BN.prototype.toTwos = function toTwos(width) {\n    if (this.negative !== 0) {\n      return this.abs().inotn(width).iaddn(1);\n    }\n    return this.clone();\n  };\n  BN.prototype.fromTwos = function fromTwos(width) {\n    if (this.testn(width - 1)) {\n      return this.notn(width).iaddn(1).ineg();\n    }\n    return this.clone();\n  };\n  BN.prototype.isNeg = function isNeg() {\n    return this.negative !== 0;\n  };\n\n  // Return negative clone of `this`\n  BN.prototype.neg = function neg() {\n    return this.clone().ineg();\n  };\n  BN.prototype.ineg = function ineg() {\n    if (!this.isZero()) {\n      this.negative ^= 1;\n    }\n    return this;\n  };\n\n  // Or `num` with `this` in-place\n  BN.prototype.iuor = function iuor(num) {\n    while (this.length < num.length) {\n      this.words[this.length++] = 0;\n    }\n    for (var i = 0; i < num.length; i++) {\n      this.words[i] = this.words[i] | num.words[i];\n    }\n    return this.strip();\n  };\n  BN.prototype.ior = function ior(num) {\n    assert((this.negative | num.negative) === 0);\n    return this.iuor(num);\n  };\n\n  // Or `num` with `this`\n  BN.prototype.or = function or(num) {\n    if (this.length > num.length) return this.clone().ior(num);\n    return num.clone().ior(this);\n  };\n  BN.prototype.uor = function uor(num) {\n    if (this.length > num.length) return this.clone().iuor(num);\n    return num.clone().iuor(this);\n  };\n\n  // And `num` with `this` in-place\n  BN.prototype.iuand = function iuand(num) {\n    // b = min-length(num, this)\n    var b;\n    if (this.length > num.length) {\n      b = num;\n    } else {\n      b = this;\n    }\n    for (var i = 0; i < b.length; i++) {\n      this.words[i] = this.words[i] & num.words[i];\n    }\n    this.length = b.length;\n    return this.strip();\n  };\n  BN.prototype.iand = function iand(num) {\n    assert((this.negative | num.negative) === 0);\n    return this.iuand(num);\n  };\n\n  // And `num` with `this`\n  BN.prototype.and = function and(num) {\n    if (this.length > num.length) return this.clone().iand(num);\n    return num.clone().iand(this);\n  };\n  BN.prototype.uand = function uand(num) {\n    if (this.length > num.length) return this.clone().iuand(num);\n    return num.clone().iuand(this);\n  };\n\n  // Xor `num` with `this` in-place\n  BN.prototype.iuxor = function iuxor(num) {\n    // a.length > b.length\n    var a;\n    var b;\n    if (this.length > num.length) {\n      a = this;\n      b = num;\n    } else {\n      a = num;\n      b = this;\n    }\n    for (var i = 0; i < b.length; i++) {\n      this.words[i] = a.words[i] ^ b.words[i];\n    }\n    if (this !== a) {\n      for (; i < a.length; i++) {\n        this.words[i] = a.words[i];\n      }\n    }\n    this.length = a.length;\n    return this.strip();\n  };\n  BN.prototype.ixor = function ixor(num) {\n    assert((this.negative | num.negative) === 0);\n    return this.iuxor(num);\n  };\n\n  // Xor `num` with `this`\n  BN.prototype.xor = function xor(num) {\n    if (this.length > num.length) return this.clone().ixor(num);\n    return num.clone().ixor(this);\n  };\n  BN.prototype.uxor = function uxor(num) {\n    if (this.length > num.length) return this.clone().iuxor(num);\n    return num.clone().iuxor(this);\n  };\n\n  // Not ``this`` with ``width`` bitwidth\n  BN.prototype.inotn = function inotn(width) {\n    assert(typeof width === 'number' && width >= 0);\n    var bytesNeeded = Math.ceil(width / 26) | 0;\n    var bitsLeft = width % 26;\n\n    // Extend the buffer with leading zeroes\n    this._expand(bytesNeeded);\n    if (bitsLeft > 0) {\n      bytesNeeded--;\n    }\n\n    // Handle complete words\n    for (var i = 0; i < bytesNeeded; i++) {\n      this.words[i] = ~this.words[i] & 0x3ffffff;\n    }\n\n    // Handle the residue\n    if (bitsLeft > 0) {\n      this.words[i] = ~this.words[i] & 0x3ffffff >> 26 - bitsLeft;\n    }\n\n    // And remove leading zeroes\n    return this.strip();\n  };\n  BN.prototype.notn = function notn(width) {\n    return this.clone().inotn(width);\n  };\n\n  // Set `bit` of `this`\n  BN.prototype.setn = function setn(bit, val) {\n    assert(typeof bit === 'number' && bit >= 0);\n    var off = bit / 26 | 0;\n    var wbit = bit % 26;\n    this._expand(off + 1);\n    if (val) {\n      this.words[off] = this.words[off] | 1 << wbit;\n    } else {\n      this.words[off] = this.words[off] & ~(1 << wbit);\n    }\n    return this.strip();\n  };\n\n  // Add `num` to `this` in-place\n  BN.prototype.iadd = function iadd(num) {\n    var r;\n\n    // negative + positive\n    if (this.negative !== 0 && num.negative === 0) {\n      this.negative = 0;\n      r = this.isub(num);\n      this.negative ^= 1;\n      return this._normSign();\n\n      // positive + negative\n    } else if (this.negative === 0 && num.negative !== 0) {\n      num.negative = 0;\n      r = this.isub(num);\n      num.negative = 1;\n      return r._normSign();\n    }\n\n    // a.length > b.length\n    var a, b;\n    if (this.length > num.length) {\n      a = this;\n      b = num;\n    } else {\n      a = num;\n      b = this;\n    }\n    var carry = 0;\n    for (var i = 0; i < b.length; i++) {\n      r = (a.words[i] | 0) + (b.words[i] | 0) + carry;\n      this.words[i] = r & 0x3ffffff;\n      carry = r >>> 26;\n    }\n    for (; carry !== 0 && i < a.length; i++) {\n      r = (a.words[i] | 0) + carry;\n      this.words[i] = r & 0x3ffffff;\n      carry = r >>> 26;\n    }\n    this.length = a.length;\n    if (carry !== 0) {\n      this.words[this.length] = carry;\n      this.length++;\n      // Copy the rest of the words\n    } else if (a !== this) {\n      for (; i < a.length; i++) {\n        this.words[i] = a.words[i];\n      }\n    }\n    return this;\n  };\n\n  // Add `num` to `this`\n  BN.prototype.add = function add(num) {\n    var res;\n    if (num.negative !== 0 && this.negative === 0) {\n      num.negative = 0;\n      res = this.sub(num);\n      num.negative ^= 1;\n      return res;\n    } else if (num.negative === 0 && this.negative !== 0) {\n      this.negative = 0;\n      res = num.sub(this);\n      this.negative = 1;\n      return res;\n    }\n    if (this.length > num.length) return this.clone().iadd(num);\n    return num.clone().iadd(this);\n  };\n\n  // Subtract `num` from `this` in-place\n  BN.prototype.isub = function isub(num) {\n    // this - (-num) = this + num\n    if (num.negative !== 0) {\n      num.negative = 0;\n      var r = this.iadd(num);\n      num.negative = 1;\n      return r._normSign();\n\n      // -this - num = -(this + num)\n    } else if (this.negative !== 0) {\n      this.negative = 0;\n      this.iadd(num);\n      this.negative = 1;\n      return this._normSign();\n    }\n\n    // At this point both numbers are positive\n    var cmp = this.cmp(num);\n\n    // Optimization - zeroify\n    if (cmp === 0) {\n      this.negative = 0;\n      this.length = 1;\n      this.words[0] = 0;\n      return this;\n    }\n\n    // a > b\n    var a, b;\n    if (cmp > 0) {\n      a = this;\n      b = num;\n    } else {\n      a = num;\n      b = this;\n    }\n    var carry = 0;\n    for (var i = 0; i < b.length; i++) {\n      r = (a.words[i] | 0) - (b.words[i] | 0) + carry;\n      carry = r >> 26;\n      this.words[i] = r & 0x3ffffff;\n    }\n    for (; carry !== 0 && i < a.length; i++) {\n      r = (a.words[i] | 0) + carry;\n      carry = r >> 26;\n      this.words[i] = r & 0x3ffffff;\n    }\n\n    // Copy rest of the words\n    if (carry === 0 && i < a.length && a !== this) {\n      for (; i < a.length; i++) {\n        this.words[i] = a.words[i];\n      }\n    }\n    this.length = Math.max(this.length, i);\n    if (a !== this) {\n      this.negative = 1;\n    }\n    return this.strip();\n  };\n\n  // Subtract `num` from `this`\n  BN.prototype.sub = function sub(num) {\n    return this.clone().isub(num);\n  };\n  function smallMulTo(self, num, out) {\n    out.negative = num.negative ^ self.negative;\n    var len = self.length + num.length | 0;\n    out.length = len;\n    len = len - 1 | 0;\n\n    // Peel one iteration (compiler can't do it, because of code complexity)\n    var a = self.words[0] | 0;\n    var b = num.words[0] | 0;\n    var r = a * b;\n    var lo = r & 0x3ffffff;\n    var carry = r / 0x4000000 | 0;\n    out.words[0] = lo;\n    for (var k = 1; k < len; k++) {\n      // Sum all words with the same `i + j = k` and accumulate `ncarry`,\n      // note that ncarry could be >= 0x3ffffff\n      var ncarry = carry >>> 26;\n      var rword = carry & 0x3ffffff;\n      var maxJ = Math.min(k, num.length - 1);\n      for (var j = Math.max(0, k - self.length + 1); j <= maxJ; j++) {\n        var i = k - j | 0;\n        a = self.words[i] | 0;\n        b = num.words[j] | 0;\n        r = a * b + rword;\n        ncarry += r / 0x4000000 | 0;\n        rword = r & 0x3ffffff;\n      }\n      out.words[k] = rword | 0;\n      carry = ncarry | 0;\n    }\n    if (carry !== 0) {\n      out.words[k] = carry | 0;\n    } else {\n      out.length--;\n    }\n    return out.strip();\n  }\n\n  // TODO(indutny): it may be reasonable to omit it for users who don't need\n  // to work with 256-bit numbers, otherwise it gives 20% improvement for 256-bit\n  // multiplication (like elliptic secp256k1).\n  var comb10MulTo = function comb10MulTo(self, num, out) {\n    var a = self.words;\n    var b = num.words;\n    var o = out.words;\n    var c = 0;\n    var lo;\n    var mid;\n    var hi;\n    var a0 = a[0] | 0;\n    var al0 = a0 & 0x1fff;\n    var ah0 = a0 >>> 13;\n    var a1 = a[1] | 0;\n    var al1 = a1 & 0x1fff;\n    var ah1 = a1 >>> 13;\n    var a2 = a[2] | 0;\n    var al2 = a2 & 0x1fff;\n    var ah2 = a2 >>> 13;\n    var a3 = a[3] | 0;\n    var al3 = a3 & 0x1fff;\n    var ah3 = a3 >>> 13;\n    var a4 = a[4] | 0;\n    var al4 = a4 & 0x1fff;\n    var ah4 = a4 >>> 13;\n    var a5 = a[5] | 0;\n    var al5 = a5 & 0x1fff;\n    var ah5 = a5 >>> 13;\n    var a6 = a[6] | 0;\n    var al6 = a6 & 0x1fff;\n    var ah6 = a6 >>> 13;\n    var a7 = a[7] | 0;\n    var al7 = a7 & 0x1fff;\n    var ah7 = a7 >>> 13;\n    var a8 = a[8] | 0;\n    var al8 = a8 & 0x1fff;\n    var ah8 = a8 >>> 13;\n    var a9 = a[9] | 0;\n    var al9 = a9 & 0x1fff;\n    var ah9 = a9 >>> 13;\n    var b0 = b[0] | 0;\n    var bl0 = b0 & 0x1fff;\n    var bh0 = b0 >>> 13;\n    var b1 = b[1] | 0;\n    var bl1 = b1 & 0x1fff;\n    var bh1 = b1 >>> 13;\n    var b2 = b[2] | 0;\n    var bl2 = b2 & 0x1fff;\n    var bh2 = b2 >>> 13;\n    var b3 = b[3] | 0;\n    var bl3 = b3 & 0x1fff;\n    var bh3 = b3 >>> 13;\n    var b4 = b[4] | 0;\n    var bl4 = b4 & 0x1fff;\n    var bh4 = b4 >>> 13;\n    var b5 = b[5] | 0;\n    var bl5 = b5 & 0x1fff;\n    var bh5 = b5 >>> 13;\n    var b6 = b[6] | 0;\n    var bl6 = b6 & 0x1fff;\n    var bh6 = b6 >>> 13;\n    var b7 = b[7] | 0;\n    var bl7 = b7 & 0x1fff;\n    var bh7 = b7 >>> 13;\n    var b8 = b[8] | 0;\n    var bl8 = b8 & 0x1fff;\n    var bh8 = b8 >>> 13;\n    var b9 = b[9] | 0;\n    var bl9 = b9 & 0x1fff;\n    var bh9 = b9 >>> 13;\n    out.negative = self.negative ^ num.negative;\n    out.length = 19;\n    /* k = 0 */\n    lo = Math.imul(al0, bl0);\n    mid = Math.imul(al0, bh0);\n    mid = mid + Math.imul(ah0, bl0) | 0;\n    hi = Math.imul(ah0, bh0);\n    var w0 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w0 >>> 26) | 0;\n    w0 &= 0x3ffffff;\n    /* k = 1 */\n    lo = Math.imul(al1, bl0);\n    mid = Math.imul(al1, bh0);\n    mid = mid + Math.imul(ah1, bl0) | 0;\n    hi = Math.imul(ah1, bh0);\n    lo = lo + Math.imul(al0, bl1) | 0;\n    mid = mid + Math.imul(al0, bh1) | 0;\n    mid = mid + Math.imul(ah0, bl1) | 0;\n    hi = hi + Math.imul(ah0, bh1) | 0;\n    var w1 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w1 >>> 26) | 0;\n    w1 &= 0x3ffffff;\n    /* k = 2 */\n    lo = Math.imul(al2, bl0);\n    mid = Math.imul(al2, bh0);\n    mid = mid + Math.imul(ah2, bl0) | 0;\n    hi = Math.imul(ah2, bh0);\n    lo = lo + Math.imul(al1, bl1) | 0;\n    mid = mid + Math.imul(al1, bh1) | 0;\n    mid = mid + Math.imul(ah1, bl1) | 0;\n    hi = hi + Math.imul(ah1, bh1) | 0;\n    lo = lo + Math.imul(al0, bl2) | 0;\n    mid = mid + Math.imul(al0, bh2) | 0;\n    mid = mid + Math.imul(ah0, bl2) | 0;\n    hi = hi + Math.imul(ah0, bh2) | 0;\n    var w2 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w2 >>> 26) | 0;\n    w2 &= 0x3ffffff;\n    /* k = 3 */\n    lo = Math.imul(al3, bl0);\n    mid = Math.imul(al3, bh0);\n    mid = mid + Math.imul(ah3, bl0) | 0;\n    hi = Math.imul(ah3, bh0);\n    lo = lo + Math.imul(al2, bl1) | 0;\n    mid = mid + Math.imul(al2, bh1) | 0;\n    mid = mid + Math.imul(ah2, bl1) | 0;\n    hi = hi + Math.imul(ah2, bh1) | 0;\n    lo = lo + Math.imul(al1, bl2) | 0;\n    mid = mid + Math.imul(al1, bh2) | 0;\n    mid = mid + Math.imul(ah1, bl2) | 0;\n    hi = hi + Math.imul(ah1, bh2) | 0;\n    lo = lo + Math.imul(al0, bl3) | 0;\n    mid = mid + Math.imul(al0, bh3) | 0;\n    mid = mid + Math.imul(ah0, bl3) | 0;\n    hi = hi + Math.imul(ah0, bh3) | 0;\n    var w3 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w3 >>> 26) | 0;\n    w3 &= 0x3ffffff;\n    /* k = 4 */\n    lo = Math.imul(al4, bl0);\n    mid = Math.imul(al4, bh0);\n    mid = mid + Math.imul(ah4, bl0) | 0;\n    hi = Math.imul(ah4, bh0);\n    lo = lo + Math.imul(al3, bl1) | 0;\n    mid = mid + Math.imul(al3, bh1) | 0;\n    mid = mid + Math.imul(ah3, bl1) | 0;\n    hi = hi + Math.imul(ah3, bh1) | 0;\n    lo = lo + Math.imul(al2, bl2) | 0;\n    mid = mid + Math.imul(al2, bh2) | 0;\n    mid = mid + Math.imul(ah2, bl2) | 0;\n    hi = hi + Math.imul(ah2, bh2) | 0;\n    lo = lo + Math.imul(al1, bl3) | 0;\n    mid = mid + Math.imul(al1, bh3) | 0;\n    mid = mid + Math.imul(ah1, bl3) | 0;\n    hi = hi + Math.imul(ah1, bh3) | 0;\n    lo = lo + Math.imul(al0, bl4) | 0;\n    mid = mid + Math.imul(al0, bh4) | 0;\n    mid = mid + Math.imul(ah0, bl4) | 0;\n    hi = hi + Math.imul(ah0, bh4) | 0;\n    var w4 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w4 >>> 26) | 0;\n    w4 &= 0x3ffffff;\n    /* k = 5 */\n    lo = Math.imul(al5, bl0);\n    mid = Math.imul(al5, bh0);\n    mid = mid + Math.imul(ah5, bl0) | 0;\n    hi = Math.imul(ah5, bh0);\n    lo = lo + Math.imul(al4, bl1) | 0;\n    mid = mid + Math.imul(al4, bh1) | 0;\n    mid = mid + Math.imul(ah4, bl1) | 0;\n    hi = hi + Math.imul(ah4, bh1) | 0;\n    lo = lo + Math.imul(al3, bl2) | 0;\n    mid = mid + Math.imul(al3, bh2) | 0;\n    mid = mid + Math.imul(ah3, bl2) | 0;\n    hi = hi + Math.imul(ah3, bh2) | 0;\n    lo = lo + Math.imul(al2, bl3) | 0;\n    mid = mid + Math.imul(al2, bh3) | 0;\n    mid = mid + Math.imul(ah2, bl3) | 0;\n    hi = hi + Math.imul(ah2, bh3) | 0;\n    lo = lo + Math.imul(al1, bl4) | 0;\n    mid = mid + Math.imul(al1, bh4) | 0;\n    mid = mid + Math.imul(ah1, bl4) | 0;\n    hi = hi + Math.imul(ah1, bh4) | 0;\n    lo = lo + Math.imul(al0, bl5) | 0;\n    mid = mid + Math.imul(al0, bh5) | 0;\n    mid = mid + Math.imul(ah0, bl5) | 0;\n    hi = hi + Math.imul(ah0, bh5) | 0;\n    var w5 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w5 >>> 26) | 0;\n    w5 &= 0x3ffffff;\n    /* k = 6 */\n    lo = Math.imul(al6, bl0);\n    mid = Math.imul(al6, bh0);\n    mid = mid + Math.imul(ah6, bl0) | 0;\n    hi = Math.imul(ah6, bh0);\n    lo = lo + Math.imul(al5, bl1) | 0;\n    mid = mid + Math.imul(al5, bh1) | 0;\n    mid = mid + Math.imul(ah5, bl1) | 0;\n    hi = hi + Math.imul(ah5, bh1) | 0;\n    lo = lo + Math.imul(al4, bl2) | 0;\n    mid = mid + Math.imul(al4, bh2) | 0;\n    mid = mid + Math.imul(ah4, bl2) | 0;\n    hi = hi + Math.imul(ah4, bh2) | 0;\n    lo = lo + Math.imul(al3, bl3) | 0;\n    mid = mid + Math.imul(al3, bh3) | 0;\n    mid = mid + Math.imul(ah3, bl3) | 0;\n    hi = hi + Math.imul(ah3, bh3) | 0;\n    lo = lo + Math.imul(al2, bl4) | 0;\n    mid = mid + Math.imul(al2, bh4) | 0;\n    mid = mid + Math.imul(ah2, bl4) | 0;\n    hi = hi + Math.imul(ah2, bh4) | 0;\n    lo = lo + Math.imul(al1, bl5) | 0;\n    mid = mid + Math.imul(al1, bh5) | 0;\n    mid = mid + Math.imul(ah1, bl5) | 0;\n    hi = hi + Math.imul(ah1, bh5) | 0;\n    lo = lo + Math.imul(al0, bl6) | 0;\n    mid = mid + Math.imul(al0, bh6) | 0;\n    mid = mid + Math.imul(ah0, bl6) | 0;\n    hi = hi + Math.imul(ah0, bh6) | 0;\n    var w6 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w6 >>> 26) | 0;\n    w6 &= 0x3ffffff;\n    /* k = 7 */\n    lo = Math.imul(al7, bl0);\n    mid = Math.imul(al7, bh0);\n    mid = mid + Math.imul(ah7, bl0) | 0;\n    hi = Math.imul(ah7, bh0);\n    lo = lo + Math.imul(al6, bl1) | 0;\n    mid = mid + Math.imul(al6, bh1) | 0;\n    mid = mid + Math.imul(ah6, bl1) | 0;\n    hi = hi + Math.imul(ah6, bh1) | 0;\n    lo = lo + Math.imul(al5, bl2) | 0;\n    mid = mid + Math.imul(al5, bh2) | 0;\n    mid = mid + Math.imul(ah5, bl2) | 0;\n    hi = hi + Math.imul(ah5, bh2) | 0;\n    lo = lo + Math.imul(al4, bl3) | 0;\n    mid = mid + Math.imul(al4, bh3) | 0;\n    mid = mid + Math.imul(ah4, bl3) | 0;\n    hi = hi + Math.imul(ah4, bh3) | 0;\n    lo = lo + Math.imul(al3, bl4) | 0;\n    mid = mid + Math.imul(al3, bh4) | 0;\n    mid = mid + Math.imul(ah3, bl4) | 0;\n    hi = hi + Math.imul(ah3, bh4) | 0;\n    lo = lo + Math.imul(al2, bl5) | 0;\n    mid = mid + Math.imul(al2, bh5) | 0;\n    mid = mid + Math.imul(ah2, bl5) | 0;\n    hi = hi + Math.imul(ah2, bh5) | 0;\n    lo = lo + Math.imul(al1, bl6) | 0;\n    mid = mid + Math.imul(al1, bh6) | 0;\n    mid = mid + Math.imul(ah1, bl6) | 0;\n    hi = hi + Math.imul(ah1, bh6) | 0;\n    lo = lo + Math.imul(al0, bl7) | 0;\n    mid = mid + Math.imul(al0, bh7) | 0;\n    mid = mid + Math.imul(ah0, bl7) | 0;\n    hi = hi + Math.imul(ah0, bh7) | 0;\n    var w7 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w7 >>> 26) | 0;\n    w7 &= 0x3ffffff;\n    /* k = 8 */\n    lo = Math.imul(al8, bl0);\n    mid = Math.imul(al8, bh0);\n    mid = mid + Math.imul(ah8, bl0) | 0;\n    hi = Math.imul(ah8, bh0);\n    lo = lo + Math.imul(al7, bl1) | 0;\n    mid = mid + Math.imul(al7, bh1) | 0;\n    mid = mid + Math.imul(ah7, bl1) | 0;\n    hi = hi + Math.imul(ah7, bh1) | 0;\n    lo = lo + Math.imul(al6, bl2) | 0;\n    mid = mid + Math.imul(al6, bh2) | 0;\n    mid = mid + Math.imul(ah6, bl2) | 0;\n    hi = hi + Math.imul(ah6, bh2) | 0;\n    lo = lo + Math.imul(al5, bl3) | 0;\n    mid = mid + Math.imul(al5, bh3) | 0;\n    mid = mid + Math.imul(ah5, bl3) | 0;\n    hi = hi + Math.imul(ah5, bh3) | 0;\n    lo = lo + Math.imul(al4, bl4) | 0;\n    mid = mid + Math.imul(al4, bh4) | 0;\n    mid = mid + Math.imul(ah4, bl4) | 0;\n    hi = hi + Math.imul(ah4, bh4) | 0;\n    lo = lo + Math.imul(al3, bl5) | 0;\n    mid = mid + Math.imul(al3, bh5) | 0;\n    mid = mid + Math.imul(ah3, bl5) | 0;\n    hi = hi + Math.imul(ah3, bh5) | 0;\n    lo = lo + Math.imul(al2, bl6) | 0;\n    mid = mid + Math.imul(al2, bh6) | 0;\n    mid = mid + Math.imul(ah2, bl6) | 0;\n    hi = hi + Math.imul(ah2, bh6) | 0;\n    lo = lo + Math.imul(al1, bl7) | 0;\n    mid = mid + Math.imul(al1, bh7) | 0;\n    mid = mid + Math.imul(ah1, bl7) | 0;\n    hi = hi + Math.imul(ah1, bh7) | 0;\n    lo = lo + Math.imul(al0, bl8) | 0;\n    mid = mid + Math.imul(al0, bh8) | 0;\n    mid = mid + Math.imul(ah0, bl8) | 0;\n    hi = hi + Math.imul(ah0, bh8) | 0;\n    var w8 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w8 >>> 26) | 0;\n    w8 &= 0x3ffffff;\n    /* k = 9 */\n    lo = Math.imul(al9, bl0);\n    mid = Math.imul(al9, bh0);\n    mid = mid + Math.imul(ah9, bl0) | 0;\n    hi = Math.imul(ah9, bh0);\n    lo = lo + Math.imul(al8, bl1) | 0;\n    mid = mid + Math.imul(al8, bh1) | 0;\n    mid = mid + Math.imul(ah8, bl1) | 0;\n    hi = hi + Math.imul(ah8, bh1) | 0;\n    lo = lo + Math.imul(al7, bl2) | 0;\n    mid = mid + Math.imul(al7, bh2) | 0;\n    mid = mid + Math.imul(ah7, bl2) | 0;\n    hi = hi + Math.imul(ah7, bh2) | 0;\n    lo = lo + Math.imul(al6, bl3) | 0;\n    mid = mid + Math.imul(al6, bh3) | 0;\n    mid = mid + Math.imul(ah6, bl3) | 0;\n    hi = hi + Math.imul(ah6, bh3) | 0;\n    lo = lo + Math.imul(al5, bl4) | 0;\n    mid = mid + Math.imul(al5, bh4) | 0;\n    mid = mid + Math.imul(ah5, bl4) | 0;\n    hi = hi + Math.imul(ah5, bh4) | 0;\n    lo = lo + Math.imul(al4, bl5) | 0;\n    mid = mid + Math.imul(al4, bh5) | 0;\n    mid = mid + Math.imul(ah4, bl5) | 0;\n    hi = hi + Math.imul(ah4, bh5) | 0;\n    lo = lo + Math.imul(al3, bl6) | 0;\n    mid = mid + Math.imul(al3, bh6) | 0;\n    mid = mid + Math.imul(ah3, bl6) | 0;\n    hi = hi + Math.imul(ah3, bh6) | 0;\n    lo = lo + Math.imul(al2, bl7) | 0;\n    mid = mid + Math.imul(al2, bh7) | 0;\n    mid = mid + Math.imul(ah2, bl7) | 0;\n    hi = hi + Math.imul(ah2, bh7) | 0;\n    lo = lo + Math.imul(al1, bl8) | 0;\n    mid = mid + Math.imul(al1, bh8) | 0;\n    mid = mid + Math.imul(ah1, bl8) | 0;\n    hi = hi + Math.imul(ah1, bh8) | 0;\n    lo = lo + Math.imul(al0, bl9) | 0;\n    mid = mid + Math.imul(al0, bh9) | 0;\n    mid = mid + Math.imul(ah0, bl9) | 0;\n    hi = hi + Math.imul(ah0, bh9) | 0;\n    var w9 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w9 >>> 26) | 0;\n    w9 &= 0x3ffffff;\n    /* k = 10 */\n    lo = Math.imul(al9, bl1);\n    mid = Math.imul(al9, bh1);\n    mid = mid + Math.imul(ah9, bl1) | 0;\n    hi = Math.imul(ah9, bh1);\n    lo = lo + Math.imul(al8, bl2) | 0;\n    mid = mid + Math.imul(al8, bh2) | 0;\n    mid = mid + Math.imul(ah8, bl2) | 0;\n    hi = hi + Math.imul(ah8, bh2) | 0;\n    lo = lo + Math.imul(al7, bl3) | 0;\n    mid = mid + Math.imul(al7, bh3) | 0;\n    mid = mid + Math.imul(ah7, bl3) | 0;\n    hi = hi + Math.imul(ah7, bh3) | 0;\n    lo = lo + Math.imul(al6, bl4) | 0;\n    mid = mid + Math.imul(al6, bh4) | 0;\n    mid = mid + Math.imul(ah6, bl4) | 0;\n    hi = hi + Math.imul(ah6, bh4) | 0;\n    lo = lo + Math.imul(al5, bl5) | 0;\n    mid = mid + Math.imul(al5, bh5) | 0;\n    mid = mid + Math.imul(ah5, bl5) | 0;\n    hi = hi + Math.imul(ah5, bh5) | 0;\n    lo = lo + Math.imul(al4, bl6) | 0;\n    mid = mid + Math.imul(al4, bh6) | 0;\n    mid = mid + Math.imul(ah4, bl6) | 0;\n    hi = hi + Math.imul(ah4, bh6) | 0;\n    lo = lo + Math.imul(al3, bl7) | 0;\n    mid = mid + Math.imul(al3, bh7) | 0;\n    mid = mid + Math.imul(ah3, bl7) | 0;\n    hi = hi + Math.imul(ah3, bh7) | 0;\n    lo = lo + Math.imul(al2, bl8) | 0;\n    mid = mid + Math.imul(al2, bh8) | 0;\n    mid = mid + Math.imul(ah2, bl8) | 0;\n    hi = hi + Math.imul(ah2, bh8) | 0;\n    lo = lo + Math.imul(al1, bl9) | 0;\n    mid = mid + Math.imul(al1, bh9) | 0;\n    mid = mid + Math.imul(ah1, bl9) | 0;\n    hi = hi + Math.imul(ah1, bh9) | 0;\n    var w10 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w10 >>> 26) | 0;\n    w10 &= 0x3ffffff;\n    /* k = 11 */\n    lo = Math.imul(al9, bl2);\n    mid = Math.imul(al9, bh2);\n    mid = mid + Math.imul(ah9, bl2) | 0;\n    hi = Math.imul(ah9, bh2);\n    lo = lo + Math.imul(al8, bl3) | 0;\n    mid = mid + Math.imul(al8, bh3) | 0;\n    mid = mid + Math.imul(ah8, bl3) | 0;\n    hi = hi + Math.imul(ah8, bh3) | 0;\n    lo = lo + Math.imul(al7, bl4) | 0;\n    mid = mid + Math.imul(al7, bh4) | 0;\n    mid = mid + Math.imul(ah7, bl4) | 0;\n    hi = hi + Math.imul(ah7, bh4) | 0;\n    lo = lo + Math.imul(al6, bl5) | 0;\n    mid = mid + Math.imul(al6, bh5) | 0;\n    mid = mid + Math.imul(ah6, bl5) | 0;\n    hi = hi + Math.imul(ah6, bh5) | 0;\n    lo = lo + Math.imul(al5, bl6) | 0;\n    mid = mid + Math.imul(al5, bh6) | 0;\n    mid = mid + Math.imul(ah5, bl6) | 0;\n    hi = hi + Math.imul(ah5, bh6) | 0;\n    lo = lo + Math.imul(al4, bl7) | 0;\n    mid = mid + Math.imul(al4, bh7) | 0;\n    mid = mid + Math.imul(ah4, bl7) | 0;\n    hi = hi + Math.imul(ah4, bh7) | 0;\n    lo = lo + Math.imul(al3, bl8) | 0;\n    mid = mid + Math.imul(al3, bh8) | 0;\n    mid = mid + Math.imul(ah3, bl8) | 0;\n    hi = hi + Math.imul(ah3, bh8) | 0;\n    lo = lo + Math.imul(al2, bl9) | 0;\n    mid = mid + Math.imul(al2, bh9) | 0;\n    mid = mid + Math.imul(ah2, bl9) | 0;\n    hi = hi + Math.imul(ah2, bh9) | 0;\n    var w11 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w11 >>> 26) | 0;\n    w11 &= 0x3ffffff;\n    /* k = 12 */\n    lo = Math.imul(al9, bl3);\n    mid = Math.imul(al9, bh3);\n    mid = mid + Math.imul(ah9, bl3) | 0;\n    hi = Math.imul(ah9, bh3);\n    lo = lo + Math.imul(al8, bl4) | 0;\n    mid = mid + Math.imul(al8, bh4) | 0;\n    mid = mid + Math.imul(ah8, bl4) | 0;\n    hi = hi + Math.imul(ah8, bh4) | 0;\n    lo = lo + Math.imul(al7, bl5) | 0;\n    mid = mid + Math.imul(al7, bh5) | 0;\n    mid = mid + Math.imul(ah7, bl5) | 0;\n    hi = hi + Math.imul(ah7, bh5) | 0;\n    lo = lo + Math.imul(al6, bl6) | 0;\n    mid = mid + Math.imul(al6, bh6) | 0;\n    mid = mid + Math.imul(ah6, bl6) | 0;\n    hi = hi + Math.imul(ah6, bh6) | 0;\n    lo = lo + Math.imul(al5, bl7) | 0;\n    mid = mid + Math.imul(al5, bh7) | 0;\n    mid = mid + Math.imul(ah5, bl7) | 0;\n    hi = hi + Math.imul(ah5, bh7) | 0;\n    lo = lo + Math.imul(al4, bl8) | 0;\n    mid = mid + Math.imul(al4, bh8) | 0;\n    mid = mid + Math.imul(ah4, bl8) | 0;\n    hi = hi + Math.imul(ah4, bh8) | 0;\n    lo = lo + Math.imul(al3, bl9) | 0;\n    mid = mid + Math.imul(al3, bh9) | 0;\n    mid = mid + Math.imul(ah3, bl9) | 0;\n    hi = hi + Math.imul(ah3, bh9) | 0;\n    var w12 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w12 >>> 26) | 0;\n    w12 &= 0x3ffffff;\n    /* k = 13 */\n    lo = Math.imul(al9, bl4);\n    mid = Math.imul(al9, bh4);\n    mid = mid + Math.imul(ah9, bl4) | 0;\n    hi = Math.imul(ah9, bh4);\n    lo = lo + Math.imul(al8, bl5) | 0;\n    mid = mid + Math.imul(al8, bh5) | 0;\n    mid = mid + Math.imul(ah8, bl5) | 0;\n    hi = hi + Math.imul(ah8, bh5) | 0;\n    lo = lo + Math.imul(al7, bl6) | 0;\n    mid = mid + Math.imul(al7, bh6) | 0;\n    mid = mid + Math.imul(ah7, bl6) | 0;\n    hi = hi + Math.imul(ah7, bh6) | 0;\n    lo = lo + Math.imul(al6, bl7) | 0;\n    mid = mid + Math.imul(al6, bh7) | 0;\n    mid = mid + Math.imul(ah6, bl7) | 0;\n    hi = hi + Math.imul(ah6, bh7) | 0;\n    lo = lo + Math.imul(al5, bl8) | 0;\n    mid = mid + Math.imul(al5, bh8) | 0;\n    mid = mid + Math.imul(ah5, bl8) | 0;\n    hi = hi + Math.imul(ah5, bh8) | 0;\n    lo = lo + Math.imul(al4, bl9) | 0;\n    mid = mid + Math.imul(al4, bh9) | 0;\n    mid = mid + Math.imul(ah4, bl9) | 0;\n    hi = hi + Math.imul(ah4, bh9) | 0;\n    var w13 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w13 >>> 26) | 0;\n    w13 &= 0x3ffffff;\n    /* k = 14 */\n    lo = Math.imul(al9, bl5);\n    mid = Math.imul(al9, bh5);\n    mid = mid + Math.imul(ah9, bl5) | 0;\n    hi = Math.imul(ah9, bh5);\n    lo = lo + Math.imul(al8, bl6) | 0;\n    mid = mid + Math.imul(al8, bh6) | 0;\n    mid = mid + Math.imul(ah8, bl6) | 0;\n    hi = hi + Math.imul(ah8, bh6) | 0;\n    lo = lo + Math.imul(al7, bl7) | 0;\n    mid = mid + Math.imul(al7, bh7) | 0;\n    mid = mid + Math.imul(ah7, bl7) | 0;\n    hi = hi + Math.imul(ah7, bh7) | 0;\n    lo = lo + Math.imul(al6, bl8) | 0;\n    mid = mid + Math.imul(al6, bh8) | 0;\n    mid = mid + Math.imul(ah6, bl8) | 0;\n    hi = hi + Math.imul(ah6, bh8) | 0;\n    lo = lo + Math.imul(al5, bl9) | 0;\n    mid = mid + Math.imul(al5, bh9) | 0;\n    mid = mid + Math.imul(ah5, bl9) | 0;\n    hi = hi + Math.imul(ah5, bh9) | 0;\n    var w14 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w14 >>> 26) | 0;\n    w14 &= 0x3ffffff;\n    /* k = 15 */\n    lo = Math.imul(al9, bl6);\n    mid = Math.imul(al9, bh6);\n    mid = mid + Math.imul(ah9, bl6) | 0;\n    hi = Math.imul(ah9, bh6);\n    lo = lo + Math.imul(al8, bl7) | 0;\n    mid = mid + Math.imul(al8, bh7) | 0;\n    mid = mid + Math.imul(ah8, bl7) | 0;\n    hi = hi + Math.imul(ah8, bh7) | 0;\n    lo = lo + Math.imul(al7, bl8) | 0;\n    mid = mid + Math.imul(al7, bh8) | 0;\n    mid = mid + Math.imul(ah7, bl8) | 0;\n    hi = hi + Math.imul(ah7, bh8) | 0;\n    lo = lo + Math.imul(al6, bl9) | 0;\n    mid = mid + Math.imul(al6, bh9) | 0;\n    mid = mid + Math.imul(ah6, bl9) | 0;\n    hi = hi + Math.imul(ah6, bh9) | 0;\n    var w15 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w15 >>> 26) | 0;\n    w15 &= 0x3ffffff;\n    /* k = 16 */\n    lo = Math.imul(al9, bl7);\n    mid = Math.imul(al9, bh7);\n    mid = mid + Math.imul(ah9, bl7) | 0;\n    hi = Math.imul(ah9, bh7);\n    lo = lo + Math.imul(al8, bl8) | 0;\n    mid = mid + Math.imul(al8, bh8) | 0;\n    mid = mid + Math.imul(ah8, bl8) | 0;\n    hi = hi + Math.imul(ah8, bh8) | 0;\n    lo = lo + Math.imul(al7, bl9) | 0;\n    mid = mid + Math.imul(al7, bh9) | 0;\n    mid = mid + Math.imul(ah7, bl9) | 0;\n    hi = hi + Math.imul(ah7, bh9) | 0;\n    var w16 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w16 >>> 26) | 0;\n    w16 &= 0x3ffffff;\n    /* k = 17 */\n    lo = Math.imul(al9, bl8);\n    mid = Math.imul(al9, bh8);\n    mid = mid + Math.imul(ah9, bl8) | 0;\n    hi = Math.imul(ah9, bh8);\n    lo = lo + Math.imul(al8, bl9) | 0;\n    mid = mid + Math.imul(al8, bh9) | 0;\n    mid = mid + Math.imul(ah8, bl9) | 0;\n    hi = hi + Math.imul(ah8, bh9) | 0;\n    var w17 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w17 >>> 26) | 0;\n    w17 &= 0x3ffffff;\n    /* k = 18 */\n    lo = Math.imul(al9, bl9);\n    mid = Math.imul(al9, bh9);\n    mid = mid + Math.imul(ah9, bl9) | 0;\n    hi = Math.imul(ah9, bh9);\n    var w18 = (c + lo | 0) + ((mid & 0x1fff) << 13) | 0;\n    c = (hi + (mid >>> 13) | 0) + (w18 >>> 26) | 0;\n    w18 &= 0x3ffffff;\n    o[0] = w0;\n    o[1] = w1;\n    o[2] = w2;\n    o[3] = w3;\n    o[4] = w4;\n    o[5] = w5;\n    o[6] = w6;\n    o[7] = w7;\n    o[8] = w8;\n    o[9] = w9;\n    o[10] = w10;\n    o[11] = w11;\n    o[12] = w12;\n    o[13] = w13;\n    o[14] = w14;\n    o[15] = w15;\n    o[16] = w16;\n    o[17] = w17;\n    o[18] = w18;\n    if (c !== 0) {\n      o[19] = c;\n      out.length++;\n    }\n    return out;\n  };\n\n  // Polyfill comb\n  if (!Math.imul) {\n    comb10MulTo = smallMulTo;\n  }\n  function bigMulTo(self, num, out) {\n    out.negative = num.negative ^ self.negative;\n    out.length = self.length + num.length;\n    var carry = 0;\n    var hncarry = 0;\n    for (var k = 0; k < out.length - 1; k++) {\n      // Sum all words with the same `i + j = k` and accumulate `ncarry`,\n      // note that ncarry could be >= 0x3ffffff\n      var ncarry = hncarry;\n      hncarry = 0;\n      var rword = carry & 0x3ffffff;\n      var maxJ = Math.min(k, num.length - 1);\n      for (var j = Math.max(0, k - self.length + 1); j <= maxJ; j++) {\n        var i = k - j;\n        var a = self.words[i] | 0;\n        var b = num.words[j] | 0;\n        var r = a * b;\n        var lo = r & 0x3ffffff;\n        ncarry = ncarry + (r / 0x4000000 | 0) | 0;\n        lo = lo + rword | 0;\n        rword = lo & 0x3ffffff;\n        ncarry = ncarry + (lo >>> 26) | 0;\n        hncarry += ncarry >>> 26;\n        ncarry &= 0x3ffffff;\n      }\n      out.words[k] = rword;\n      carry = ncarry;\n      ncarry = hncarry;\n    }\n    if (carry !== 0) {\n      out.words[k] = carry;\n    } else {\n      out.length--;\n    }\n    return out.strip();\n  }\n  function jumboMulTo(self, num, out) {\n    var fftm = new FFTM();\n    return fftm.mulp(self, num, out);\n  }\n  BN.prototype.mulTo = function mulTo(num, out) {\n    var res;\n    var len = this.length + num.length;\n    if (this.length === 10 && num.length === 10) {\n      res = comb10MulTo(this, num, out);\n    } else if (len < 63) {\n      res = smallMulTo(this, num, out);\n    } else if (len < 1024) {\n      res = bigMulTo(this, num, out);\n    } else {\n      res = jumboMulTo(this, num, out);\n    }\n    return res;\n  };\n\n  // Cooley-Tukey algorithm for FFT\n  // slightly revisited to rely on looping instead of recursion\n\n  function FFTM(x, y) {\n    this.x = x;\n    this.y = y;\n  }\n  FFTM.prototype.makeRBT = function makeRBT(N) {\n    var t = new Array(N);\n    var l = BN.prototype._countBits(N) - 1;\n    for (var i = 0; i < N; i++) {\n      t[i] = this.revBin(i, l, N);\n    }\n    return t;\n  };\n\n  // Returns binary-reversed representation of `x`\n  FFTM.prototype.revBin = function revBin(x, l, N) {\n    if (x === 0 || x === N - 1) return x;\n    var rb = 0;\n    for (var i = 0; i < l; i++) {\n      rb |= (x & 1) << l - i - 1;\n      x >>= 1;\n    }\n    return rb;\n  };\n\n  // Performs \"tweedling\" phase, therefore 'emulating'\n  // behaviour of the recursive algorithm\n  FFTM.prototype.permute = function permute(rbt, rws, iws, rtws, itws, N) {\n    for (var i = 0; i < N; i++) {\n      rtws[i] = rws[rbt[i]];\n      itws[i] = iws[rbt[i]];\n    }\n  };\n  FFTM.prototype.transform = function transform(rws, iws, rtws, itws, N, rbt) {\n    this.permute(rbt, rws, iws, rtws, itws, N);\n    for (var s = 1; s < N; s <<= 1) {\n      var l = s << 1;\n      var rtwdf = Math.cos(2 * Math.PI / l);\n      var itwdf = Math.sin(2 * Math.PI / l);\n      for (var p = 0; p < N; p += l) {\n        var rtwdf_ = rtwdf;\n        var itwdf_ = itwdf;\n        for (var j = 0; j < s; j++) {\n          var re = rtws[p + j];\n          var ie = itws[p + j];\n          var ro = rtws[p + j + s];\n          var io = itws[p + j + s];\n          var rx = rtwdf_ * ro - itwdf_ * io;\n          io = rtwdf_ * io + itwdf_ * ro;\n          ro = rx;\n          rtws[p + j] = re + ro;\n          itws[p + j] = ie + io;\n          rtws[p + j + s] = re - ro;\n          itws[p + j + s] = ie - io;\n\n          /* jshint maxdepth : false */\n          if (j !== l) {\n            rx = rtwdf * rtwdf_ - itwdf * itwdf_;\n            itwdf_ = rtwdf * itwdf_ + itwdf * rtwdf_;\n            rtwdf_ = rx;\n          }\n        }\n      }\n    }\n  };\n  FFTM.prototype.guessLen13b = function guessLen13b(n, m) {\n    var N = Math.max(m, n) | 1;\n    var odd = N & 1;\n    var i = 0;\n    for (N = N / 2 | 0; N; N = N >>> 1) {\n      i++;\n    }\n    return 1 << i + 1 + odd;\n  };\n  FFTM.prototype.conjugate = function conjugate(rws, iws, N) {\n    if (N <= 1) return;\n    for (var i = 0; i < N / 2; i++) {\n      var t = rws[i];\n      rws[i] = rws[N - i - 1];\n      rws[N - i - 1] = t;\n      t = iws[i];\n      iws[i] = -iws[N - i - 1];\n      iws[N - i - 1] = -t;\n    }\n  };\n  FFTM.prototype.normalize13b = function normalize13b(ws, N) {\n    var carry = 0;\n    for (var i = 0; i < N / 2; i++) {\n      var w = Math.round(ws[2 * i + 1] / N) * 0x2000 + Math.round(ws[2 * i] / N) + carry;\n      ws[i] = w & 0x3ffffff;\n      if (w < 0x4000000) {\n        carry = 0;\n      } else {\n        carry = w / 0x4000000 | 0;\n      }\n    }\n    return ws;\n  };\n  FFTM.prototype.convert13b = function convert13b(ws, len, rws, N) {\n    var carry = 0;\n    for (var i = 0; i < len; i++) {\n      carry = carry + (ws[i] | 0);\n      rws[2 * i] = carry & 0x1fff;\n      carry = carry >>> 13;\n      rws[2 * i + 1] = carry & 0x1fff;\n      carry = carry >>> 13;\n    }\n\n    // Pad with zeroes\n    for (i = 2 * len; i < N; ++i) {\n      rws[i] = 0;\n    }\n    assert(carry === 0);\n    assert((carry & ~0x1fff) === 0);\n  };\n  FFTM.prototype.stub = function stub(N) {\n    var ph = new Array(N);\n    for (var i = 0; i < N; i++) {\n      ph[i] = 0;\n    }\n    return ph;\n  };\n  FFTM.prototype.mulp = function mulp(x, y, out) {\n    var N = 2 * this.guessLen13b(x.length, y.length);\n    var rbt = this.makeRBT(N);\n    var _ = this.stub(N);\n    var rws = new Array(N);\n    var rwst = new Array(N);\n    var iwst = new Array(N);\n    var nrws = new Array(N);\n    var nrwst = new Array(N);\n    var niwst = new Array(N);\n    var rmws = out.words;\n    rmws.length = N;\n    this.convert13b(x.words, x.length, rws, N);\n    this.convert13b(y.words, y.length, nrws, N);\n    this.transform(rws, _, rwst, iwst, N, rbt);\n    this.transform(nrws, _, nrwst, niwst, N, rbt);\n    for (var i = 0; i < N; i++) {\n      var rx = rwst[i] * nrwst[i] - iwst[i] * niwst[i];\n      iwst[i] = rwst[i] * niwst[i] + iwst[i] * nrwst[i];\n      rwst[i] = rx;\n    }\n    this.conjugate(rwst, iwst, N);\n    this.transform(rwst, iwst, rmws, _, N, rbt);\n    this.conjugate(rmws, _, N);\n    this.normalize13b(rmws, N);\n    out.negative = x.negative ^ y.negative;\n    out.length = x.length + y.length;\n    return out.strip();\n  };\n\n  // Multiply `this` by `num`\n  BN.prototype.mul = function mul(num) {\n    var out = new BN(null);\n    out.words = new Array(this.length + num.length);\n    return this.mulTo(num, out);\n  };\n\n  // Multiply employing FFT\n  BN.prototype.mulf = function mulf(num) {\n    var out = new BN(null);\n    out.words = new Array(this.length + num.length);\n    return jumboMulTo(this, num, out);\n  };\n\n  // In-place Multiplication\n  BN.prototype.imul = function imul(num) {\n    return this.clone().mulTo(num, this);\n  };\n  BN.prototype.imuln = function imuln(num) {\n    assert(typeof num === 'number');\n    assert(num < 0x4000000);\n\n    // Carry\n    var carry = 0;\n    for (var i = 0; i < this.length; i++) {\n      var w = (this.words[i] | 0) * num;\n      var lo = (w & 0x3ffffff) + (carry & 0x3ffffff);\n      carry >>= 26;\n      carry += w / 0x4000000 | 0;\n      // NOTE: lo is 27bit maximum\n      carry += lo >>> 26;\n      this.words[i] = lo & 0x3ffffff;\n    }\n    if (carry !== 0) {\n      this.words[i] = carry;\n      this.length++;\n    }\n    return this;\n  };\n  BN.prototype.muln = function muln(num) {\n    return this.clone().imuln(num);\n  };\n\n  // `this` * `this`\n  BN.prototype.sqr = function sqr() {\n    return this.mul(this);\n  };\n\n  // `this` * `this` in-place\n  BN.prototype.isqr = function isqr() {\n    return this.imul(this.clone());\n  };\n\n  // Math.pow(`this`, `num`)\n  BN.prototype.pow = function pow(num) {\n    var w = toBitArray(num);\n    if (w.length === 0) return new BN(1);\n\n    // Skip leading zeroes\n    var res = this;\n    for (var i = 0; i < w.length; i++, res = res.sqr()) {\n      if (w[i] !== 0) break;\n    }\n    if (++i < w.length) {\n      for (var q = res.sqr(); i < w.length; i++, q = q.sqr()) {\n        if (w[i] === 0) continue;\n        res = res.mul(q);\n      }\n    }\n    return res;\n  };\n\n  // Shift-left in-place\n  BN.prototype.iushln = function iushln(bits) {\n    assert(typeof bits === 'number' && bits >= 0);\n    var r = bits % 26;\n    var s = (bits - r) / 26;\n    var carryMask = 0x3ffffff >>> 26 - r << 26 - r;\n    var i;\n    if (r !== 0) {\n      var carry = 0;\n      for (i = 0; i < this.length; i++) {\n        var newCarry = this.words[i] & carryMask;\n        var c = (this.words[i] | 0) - newCarry << r;\n        this.words[i] = c | carry;\n        carry = newCarry >>> 26 - r;\n      }\n      if (carry) {\n        this.words[i] = carry;\n        this.length++;\n      }\n    }\n    if (s !== 0) {\n      for (i = this.length - 1; i >= 0; i--) {\n        this.words[i + s] = this.words[i];\n      }\n      for (i = 0; i < s; i++) {\n        this.words[i] = 0;\n      }\n      this.length += s;\n    }\n    return this.strip();\n  };\n  BN.prototype.ishln = function ishln(bits) {\n    // TODO(indutny): implement me\n    assert(this.negative === 0);\n    return this.iushln(bits);\n  };\n\n  // Shift-right in-place\n  // NOTE: `hint` is a lowest bit before trailing zeroes\n  // NOTE: if `extended` is present - it will be filled with destroyed bits\n  BN.prototype.iushrn = function iushrn(bits, hint, extended) {\n    assert(typeof bits === 'number' && bits >= 0);\n    var h;\n    if (hint) {\n      h = (hint - hint % 26) / 26;\n    } else {\n      h = 0;\n    }\n    var r = bits % 26;\n    var s = Math.min((bits - r) / 26, this.length);\n    var mask = 0x3ffffff ^ 0x3ffffff >>> r << r;\n    var maskedWords = extended;\n    h -= s;\n    h = Math.max(0, h);\n\n    // Extended mode, copy masked part\n    if (maskedWords) {\n      for (var i = 0; i < s; i++) {\n        maskedWords.words[i] = this.words[i];\n      }\n      maskedWords.length = s;\n    }\n    if (s === 0) {\n      // No-op, we should not move anything at all\n    } else if (this.length > s) {\n      this.length -= s;\n      for (i = 0; i < this.length; i++) {\n        this.words[i] = this.words[i + s];\n      }\n    } else {\n      this.words[0] = 0;\n      this.length = 1;\n    }\n    var carry = 0;\n    for (i = this.length - 1; i >= 0 && (carry !== 0 || i >= h); i--) {\n      var word = this.words[i] | 0;\n      this.words[i] = carry << 26 - r | word >>> r;\n      carry = word & mask;\n    }\n\n    // Push carried bits as a mask\n    if (maskedWords && carry !== 0) {\n      maskedWords.words[maskedWords.length++] = carry;\n    }\n    if (this.length === 0) {\n      this.words[0] = 0;\n      this.length = 1;\n    }\n    return this.strip();\n  };\n  BN.prototype.ishrn = function ishrn(bits, hint, extended) {\n    // TODO(indutny): implement me\n    assert(this.negative === 0);\n    return this.iushrn(bits, hint, extended);\n  };\n\n  // Shift-left\n  BN.prototype.shln = function shln(bits) {\n    return this.clone().ishln(bits);\n  };\n  BN.prototype.ushln = function ushln(bits) {\n    return this.clone().iushln(bits);\n  };\n\n  // Shift-right\n  BN.prototype.shrn = function shrn(bits) {\n    return this.clone().ishrn(bits);\n  };\n  BN.prototype.ushrn = function ushrn(bits) {\n    return this.clone().iushrn(bits);\n  };\n\n  // Test if n bit is set\n  BN.prototype.testn = function testn(bit) {\n    assert(typeof bit === 'number' && bit >= 0);\n    var r = bit % 26;\n    var s = (bit - r) / 26;\n    var q = 1 << r;\n\n    // Fast case: bit is much higher than all existing words\n    if (this.length <= s) return false;\n\n    // Check bit and return\n    var w = this.words[s];\n    return !!(w & q);\n  };\n\n  // Return only lowers bits of number (in-place)\n  BN.prototype.imaskn = function imaskn(bits) {\n    assert(typeof bits === 'number' && bits >= 0);\n    var r = bits % 26;\n    var s = (bits - r) / 26;\n    assert(this.negative === 0, 'imaskn works only with positive numbers');\n    if (this.length <= s) {\n      return this;\n    }\n    if (r !== 0) {\n      s++;\n    }\n    this.length = Math.min(s, this.length);\n    if (r !== 0) {\n      var mask = 0x3ffffff ^ 0x3ffffff >>> r << r;\n      this.words[this.length - 1] &= mask;\n    }\n    return this.strip();\n  };\n\n  // Return only lowers bits of number\n  BN.prototype.maskn = function maskn(bits) {\n    return this.clone().imaskn(bits);\n  };\n\n  // Add plain number `num` to `this`\n  BN.prototype.iaddn = function iaddn(num) {\n    assert(typeof num === 'number');\n    assert(num < 0x4000000);\n    if (num < 0) return this.isubn(-num);\n\n    // Possible sign change\n    if (this.negative !== 0) {\n      if (this.length === 1 && (this.words[0] | 0) < num) {\n        this.words[0] = num - (this.words[0] | 0);\n        this.negative = 0;\n        return this;\n      }\n      this.negative = 0;\n      this.isubn(num);\n      this.negative = 1;\n      return this;\n    }\n\n    // Add without checks\n    return this._iaddn(num);\n  };\n  BN.prototype._iaddn = function _iaddn(num) {\n    this.words[0] += num;\n\n    // Carry\n    for (var i = 0; i < this.length && this.words[i] >= 0x4000000; i++) {\n      this.words[i] -= 0x4000000;\n      if (i === this.length - 1) {\n        this.words[i + 1] = 1;\n      } else {\n        this.words[i + 1]++;\n      }\n    }\n    this.length = Math.max(this.length, i + 1);\n    return this;\n  };\n\n  // Subtract plain number `num` from `this`\n  BN.prototype.isubn = function isubn(num) {\n    assert(typeof num === 'number');\n    assert(num < 0x4000000);\n    if (num < 0) return this.iaddn(-num);\n    if (this.negative !== 0) {\n      this.negative = 0;\n      this.iaddn(num);\n      this.negative = 1;\n      return this;\n    }\n    this.words[0] -= num;\n    if (this.length === 1 && this.words[0] < 0) {\n      this.words[0] = -this.words[0];\n      this.negative = 1;\n    } else {\n      // Carry\n      for (var i = 0; i < this.length && this.words[i] < 0; i++) {\n        this.words[i] += 0x4000000;\n        this.words[i + 1] -= 1;\n      }\n    }\n    return this.strip();\n  };\n  BN.prototype.addn = function addn(num) {\n    return this.clone().iaddn(num);\n  };\n  BN.prototype.subn = function subn(num) {\n    return this.clone().isubn(num);\n  };\n  BN.prototype.iabs = function iabs() {\n    this.negative = 0;\n    return this;\n  };\n  BN.prototype.abs = function abs() {\n    return this.clone().iabs();\n  };\n  BN.prototype._ishlnsubmul = function _ishlnsubmul(num, mul, shift) {\n    var len = num.length + shift;\n    var i;\n    this._expand(len);\n    var w;\n    var carry = 0;\n    for (i = 0; i < num.length; i++) {\n      w = (this.words[i + shift] | 0) + carry;\n      var right = (num.words[i] | 0) * mul;\n      w -= right & 0x3ffffff;\n      carry = (w >> 26) - (right / 0x4000000 | 0);\n      this.words[i + shift] = w & 0x3ffffff;\n    }\n    for (; i < this.length - shift; i++) {\n      w = (this.words[i + shift] | 0) + carry;\n      carry = w >> 26;\n      this.words[i + shift] = w & 0x3ffffff;\n    }\n    if (carry === 0) return this.strip();\n\n    // Subtraction overflow\n    assert(carry === -1);\n    carry = 0;\n    for (i = 0; i < this.length; i++) {\n      w = -(this.words[i] | 0) + carry;\n      carry = w >> 26;\n      this.words[i] = w & 0x3ffffff;\n    }\n    this.negative = 1;\n    return this.strip();\n  };\n  BN.prototype._wordDiv = function _wordDiv(num, mode) {\n    var shift = this.length - num.length;\n    var a = this.clone();\n    var b = num;\n\n    // Normalize\n    var bhi = b.words[b.length - 1] | 0;\n    var bhiBits = this._countBits(bhi);\n    shift = 26 - bhiBits;\n    if (shift !== 0) {\n      b = b.ushln(shift);\n      a.iushln(shift);\n      bhi = b.words[b.length - 1] | 0;\n    }\n\n    // Initialize quotient\n    var m = a.length - b.length;\n    var q;\n    if (mode !== 'mod') {\n      q = new BN(null);\n      q.length = m + 1;\n      q.words = new Array(q.length);\n      for (var i = 0; i < q.length; i++) {\n        q.words[i] = 0;\n      }\n    }\n    var diff = a.clone()._ishlnsubmul(b, 1, m);\n    if (diff.negative === 0) {\n      a = diff;\n      if (q) {\n        q.words[m] = 1;\n      }\n    }\n    for (var j = m - 1; j >= 0; j--) {\n      var qj = (a.words[b.length + j] | 0) * 0x4000000 + (a.words[b.length + j - 1] | 0);\n\n      // NOTE: (qj / bhi) is (0x3ffffff * 0x4000000 + 0x3ffffff) / 0x2000000 max\n      // (0x7ffffff)\n      qj = Math.min(qj / bhi | 0, 0x3ffffff);\n      a._ishlnsubmul(b, qj, j);\n      while (a.negative !== 0) {\n        qj--;\n        a.negative = 0;\n        a._ishlnsubmul(b, 1, j);\n        if (!a.isZero()) {\n          a.negative ^= 1;\n        }\n      }\n      if (q) {\n        q.words[j] = qj;\n      }\n    }\n    if (q) {\n      q.strip();\n    }\n    a.strip();\n\n    // Denormalize\n    if (mode !== 'div' && shift !== 0) {\n      a.iushrn(shift);\n    }\n    return {\n      div: q || null,\n      mod: a\n    };\n  };\n\n  // NOTE: 1) `mode` can be set to `mod` to request mod only,\n  //       to `div` to request div only, or be absent to\n  //       request both div & mod\n  //       2) `positive` is true if unsigned mod is requested\n  BN.prototype.divmod = function divmod(num, mode, positive) {\n    assert(!num.isZero());\n    if (this.isZero()) {\n      return {\n        div: new BN(0),\n        mod: new BN(0)\n      };\n    }\n    var div, mod, res;\n    if (this.negative !== 0 && num.negative === 0) {\n      res = this.neg().divmod(num, mode);\n      if (mode !== 'mod') {\n        div = res.div.neg();\n      }\n      if (mode !== 'div') {\n        mod = res.mod.neg();\n        if (positive && mod.negative !== 0) {\n          mod.iadd(num);\n        }\n      }\n      return {\n        div: div,\n        mod: mod\n      };\n    }\n    if (this.negative === 0 && num.negative !== 0) {\n      res = this.divmod(num.neg(), mode);\n      if (mode !== 'mod') {\n        div = res.div.neg();\n      }\n      return {\n        div: div,\n        mod: res.mod\n      };\n    }\n    if ((this.negative & num.negative) !== 0) {\n      res = this.neg().divmod(num.neg(), mode);\n      if (mode !== 'div') {\n        mod = res.mod.neg();\n        if (positive && mod.negative !== 0) {\n          mod.isub(num);\n        }\n      }\n      return {\n        div: res.div,\n        mod: mod\n      };\n    }\n\n    // Both numbers are positive at this point\n\n    // Strip both numbers to approximate shift value\n    if (num.length > this.length || this.cmp(num) < 0) {\n      return {\n        div: new BN(0),\n        mod: this\n      };\n    }\n\n    // Very short reduction\n    if (num.length === 1) {\n      if (mode === 'div') {\n        return {\n          div: this.divn(num.words[0]),\n          mod: null\n        };\n      }\n      if (mode === 'mod') {\n        return {\n          div: null,\n          mod: new BN(this.modn(num.words[0]))\n        };\n      }\n      return {\n        div: this.divn(num.words[0]),\n        mod: new BN(this.modn(num.words[0]))\n      };\n    }\n    return this._wordDiv(num, mode);\n  };\n\n  // Find `this` / `num`\n  BN.prototype.div = function div(num) {\n    return this.divmod(num, 'div', false).div;\n  };\n\n  // Find `this` % `num`\n  BN.prototype.mod = function mod(num) {\n    return this.divmod(num, 'mod', false).mod;\n  };\n  BN.prototype.umod = function umod(num) {\n    return this.divmod(num, 'mod', true).mod;\n  };\n\n  // Find Round(`this` / `num`)\n  BN.prototype.divRound = function divRound(num) {\n    var dm = this.divmod(num);\n\n    // Fast case - exact division\n    if (dm.mod.isZero()) return dm.div;\n    var mod = dm.div.negative !== 0 ? dm.mod.isub(num) : dm.mod;\n    var half = num.ushrn(1);\n    var r2 = num.andln(1);\n    var cmp = mod.cmp(half);\n\n    // Round down\n    if (cmp < 0 || r2 === 1 && cmp === 0) return dm.div;\n\n    // Round up\n    return dm.div.negative !== 0 ? dm.div.isubn(1) : dm.div.iaddn(1);\n  };\n  BN.prototype.modn = function modn(num) {\n    assert(num <= 0x3ffffff);\n    var p = (1 << 26) % num;\n    var acc = 0;\n    for (var i = this.length - 1; i >= 0; i--) {\n      acc = (p * acc + (this.words[i] | 0)) % num;\n    }\n    return acc;\n  };\n\n  // In-place division by number\n  BN.prototype.idivn = function idivn(num) {\n    assert(num <= 0x3ffffff);\n    var carry = 0;\n    for (var i = this.length - 1; i >= 0; i--) {\n      var w = (this.words[i] | 0) + carry * 0x4000000;\n      this.words[i] = w / num | 0;\n      carry = w % num;\n    }\n    return this.strip();\n  };\n  BN.prototype.divn = function divn(num) {\n    return this.clone().idivn(num);\n  };\n  BN.prototype.egcd = function egcd(p) {\n    assert(p.negative === 0);\n    assert(!p.isZero());\n    var x = this;\n    var y = p.clone();\n    if (x.negative !== 0) {\n      x = x.umod(p);\n    } else {\n      x = x.clone();\n    }\n\n    // A * x + B * y = x\n    var A = new BN(1);\n    var B = new BN(0);\n\n    // C * x + D * y = y\n    var C = new BN(0);\n    var D = new BN(1);\n    var g = 0;\n    while (x.isEven() && y.isEven()) {\n      x.iushrn(1);\n      y.iushrn(1);\n      ++g;\n    }\n    var yp = y.clone();\n    var xp = x.clone();\n    while (!x.isZero()) {\n      for (var i = 0, im = 1; (x.words[0] & im) === 0 && i < 26; ++i, im <<= 1);\n      if (i > 0) {\n        x.iushrn(i);\n        while (i-- > 0) {\n          if (A.isOdd() || B.isOdd()) {\n            A.iadd(yp);\n            B.isub(xp);\n          }\n          A.iushrn(1);\n          B.iushrn(1);\n        }\n      }\n      for (var j = 0, jm = 1; (y.words[0] & jm) === 0 && j < 26; ++j, jm <<= 1);\n      if (j > 0) {\n        y.iushrn(j);\n        while (j-- > 0) {\n          if (C.isOdd() || D.isOdd()) {\n            C.iadd(yp);\n            D.isub(xp);\n          }\n          C.iushrn(1);\n          D.iushrn(1);\n        }\n      }\n      if (x.cmp(y) >= 0) {\n        x.isub(y);\n        A.isub(C);\n        B.isub(D);\n      } else {\n        y.isub(x);\n        C.isub(A);\n        D.isub(B);\n      }\n    }\n    return {\n      a: C,\n      b: D,\n      gcd: y.iushln(g)\n    };\n  };\n\n  // This is reduced incarnation of the binary EEA\n  // above, designated to invert members of the\n  // _prime_ fields F(p) at a maximal speed\n  BN.prototype._invmp = function _invmp(p) {\n    assert(p.negative === 0);\n    assert(!p.isZero());\n    var a = this;\n    var b = p.clone();\n    if (a.negative !== 0) {\n      a = a.umod(p);\n    } else {\n      a = a.clone();\n    }\n    var x1 = new BN(1);\n    var x2 = new BN(0);\n    var delta = b.clone();\n    while (a.cmpn(1) > 0 && b.cmpn(1) > 0) {\n      for (var i = 0, im = 1; (a.words[0] & im) === 0 && i < 26; ++i, im <<= 1);\n      if (i > 0) {\n        a.iushrn(i);\n        while (i-- > 0) {\n          if (x1.isOdd()) {\n            x1.iadd(delta);\n          }\n          x1.iushrn(1);\n        }\n      }\n      for (var j = 0, jm = 1; (b.words[0] & jm) === 0 && j < 26; ++j, jm <<= 1);\n      if (j > 0) {\n        b.iushrn(j);\n        while (j-- > 0) {\n          if (x2.isOdd()) {\n            x2.iadd(delta);\n          }\n          x2.iushrn(1);\n        }\n      }\n      if (a.cmp(b) >= 0) {\n        a.isub(b);\n        x1.isub(x2);\n      } else {\n        b.isub(a);\n        x2.isub(x1);\n      }\n    }\n    var res;\n    if (a.cmpn(1) === 0) {\n      res = x1;\n    } else {\n      res = x2;\n    }\n    if (res.cmpn(0) < 0) {\n      res.iadd(p);\n    }\n    return res;\n  };\n  BN.prototype.gcd = function gcd(num) {\n    if (this.isZero()) return num.abs();\n    if (num.isZero()) return this.abs();\n    var a = this.clone();\n    var b = num.clone();\n    a.negative = 0;\n    b.negative = 0;\n\n    // Remove common factor of two\n    for (var shift = 0; a.isEven() && b.isEven(); shift++) {\n      a.iushrn(1);\n      b.iushrn(1);\n    }\n    do {\n      while (a.isEven()) {\n        a.iushrn(1);\n      }\n      while (b.isEven()) {\n        b.iushrn(1);\n      }\n      var r = a.cmp(b);\n      if (r < 0) {\n        // Swap `a` and `b` to make `a` always bigger than `b`\n        var t = a;\n        a = b;\n        b = t;\n      } else if (r === 0 || b.cmpn(1) === 0) {\n        break;\n      }\n      a.isub(b);\n    } while (true);\n    return b.iushln(shift);\n  };\n\n  // Invert number in the field F(num)\n  BN.prototype.invm = function invm(num) {\n    return this.egcd(num).a.umod(num);\n  };\n  BN.prototype.isEven = function isEven() {\n    return (this.words[0] & 1) === 0;\n  };\n  BN.prototype.isOdd = function isOdd() {\n    return (this.words[0] & 1) === 1;\n  };\n\n  // And first word and num\n  BN.prototype.andln = function andln(num) {\n    return this.words[0] & num;\n  };\n\n  // Increment at the bit position in-line\n  BN.prototype.bincn = function bincn(bit) {\n    assert(typeof bit === 'number');\n    var r = bit % 26;\n    var s = (bit - r) / 26;\n    var q = 1 << r;\n\n    // Fast case: bit is much higher than all existing words\n    if (this.length <= s) {\n      this._expand(s + 1);\n      this.words[s] |= q;\n      return this;\n    }\n\n    // Add bit and propagate, if needed\n    var carry = q;\n    for (var i = s; carry !== 0 && i < this.length; i++) {\n      var w = this.words[i] | 0;\n      w += carry;\n      carry = w >>> 26;\n      w &= 0x3ffffff;\n      this.words[i] = w;\n    }\n    if (carry !== 0) {\n      this.words[i] = carry;\n      this.length++;\n    }\n    return this;\n  };\n  BN.prototype.isZero = function isZero() {\n    return this.length === 1 && this.words[0] === 0;\n  };\n  BN.prototype.cmpn = function cmpn(num) {\n    var negative = num < 0;\n    if (this.negative !== 0 && !negative) return -1;\n    if (this.negative === 0 && negative) return 1;\n    this.strip();\n    var res;\n    if (this.length > 1) {\n      res = 1;\n    } else {\n      if (negative) {\n        num = -num;\n      }\n      assert(num <= 0x3ffffff, 'Number is too big');\n      var w = this.words[0] | 0;\n      res = w === num ? 0 : w < num ? -1 : 1;\n    }\n    if (this.negative !== 0) return -res | 0;\n    return res;\n  };\n\n  // Compare two numbers and return:\n  // 1 - if `this` > `num`\n  // 0 - if `this` == `num`\n  // -1 - if `this` < `num`\n  BN.prototype.cmp = function cmp(num) {\n    if (this.negative !== 0 && num.negative === 0) return -1;\n    if (this.negative === 0 && num.negative !== 0) return 1;\n    var res = this.ucmp(num);\n    if (this.negative !== 0) return -res | 0;\n    return res;\n  };\n\n  // Unsigned comparison\n  BN.prototype.ucmp = function ucmp(num) {\n    // At this point both numbers have the same sign\n    if (this.length > num.length) return 1;\n    if (this.length < num.length) return -1;\n    var res = 0;\n    for (var i = this.length - 1; i >= 0; i--) {\n      var a = this.words[i] | 0;\n      var b = num.words[i] | 0;\n      if (a === b) continue;\n      if (a < b) {\n        res = -1;\n      } else if (a > b) {\n        res = 1;\n      }\n      break;\n    }\n    return res;\n  };\n  BN.prototype.gtn = function gtn(num) {\n    return this.cmpn(num) === 1;\n  };\n  BN.prototype.gt = function gt(num) {\n    return this.cmp(num) === 1;\n  };\n  BN.prototype.gten = function gten(num) {\n    return this.cmpn(num) >= 0;\n  };\n  BN.prototype.gte = function gte(num) {\n    return this.cmp(num) >= 0;\n  };\n  BN.prototype.ltn = function ltn(num) {\n    return this.cmpn(num) === -1;\n  };\n  BN.prototype.lt = function lt(num) {\n    return this.cmp(num) === -1;\n  };\n  BN.prototype.lten = function lten(num) {\n    return this.cmpn(num) <= 0;\n  };\n  BN.prototype.lte = function lte(num) {\n    return this.cmp(num) <= 0;\n  };\n  BN.prototype.eqn = function eqn(num) {\n    return this.cmpn(num) === 0;\n  };\n  BN.prototype.eq = function eq(num) {\n    return this.cmp(num) === 0;\n  };\n\n  //\n  // A reduce context, could be using montgomery or something better, depending\n  // on the `m` itself.\n  //\n  BN.red = function red(num) {\n    return new Red(num);\n  };\n  BN.prototype.toRed = function toRed(ctx) {\n    assert(!this.red, 'Already a number in reduction context');\n    assert(this.negative === 0, 'red works only with positives');\n    return ctx.convertTo(this)._forceRed(ctx);\n  };\n  BN.prototype.fromRed = function fromRed() {\n    assert(this.red, 'fromRed works only with numbers in reduction context');\n    return this.red.convertFrom(this);\n  };\n  BN.prototype._forceRed = function _forceRed(ctx) {\n    this.red = ctx;\n    return this;\n  };\n  BN.prototype.forceRed = function forceRed(ctx) {\n    assert(!this.red, 'Already a number in reduction context');\n    return this._forceRed(ctx);\n  };\n  BN.prototype.redAdd = function redAdd(num) {\n    assert(this.red, 'redAdd works only with red numbers');\n    return this.red.add(this, num);\n  };\n  BN.prototype.redIAdd = function redIAdd(num) {\n    assert(this.red, 'redIAdd works only with red numbers');\n    return this.red.iadd(this, num);\n  };\n  BN.prototype.redSub = function redSub(num) {\n    assert(this.red, 'redSub works only with red numbers');\n    return this.red.sub(this, num);\n  };\n  BN.prototype.redISub = function redISub(num) {\n    assert(this.red, 'redISub works only with red numbers');\n    return this.red.isub(this, num);\n  };\n  BN.prototype.redShl = function redShl(num) {\n    assert(this.red, 'redShl works only with red numbers');\n    return this.red.shl(this, num);\n  };\n  BN.prototype.redMul = function redMul(num) {\n    assert(this.red, 'redMul works only with red numbers');\n    this.red._verify2(this, num);\n    return this.red.mul(this, num);\n  };\n  BN.prototype.redIMul = function redIMul(num) {\n    assert(this.red, 'redMul works only with red numbers');\n    this.red._verify2(this, num);\n    return this.red.imul(this, num);\n  };\n  BN.prototype.redSqr = function redSqr() {\n    assert(this.red, 'redSqr works only with red numbers');\n    this.red._verify1(this);\n    return this.red.sqr(this);\n  };\n  BN.prototype.redISqr = function redISqr() {\n    assert(this.red, 'redISqr works only with red numbers');\n    this.red._verify1(this);\n    return this.red.isqr(this);\n  };\n\n  // Square root over p\n  BN.prototype.redSqrt = function redSqrt() {\n    assert(this.red, 'redSqrt works only with red numbers');\n    this.red._verify1(this);\n    return this.red.sqrt(this);\n  };\n  BN.prototype.redInvm = function redInvm() {\n    assert(this.red, 'redInvm works only with red numbers');\n    this.red._verify1(this);\n    return this.red.invm(this);\n  };\n\n  // Return negative clone of `this` % `red modulo`\n  BN.prototype.redNeg = function redNeg() {\n    assert(this.red, 'redNeg works only with red numbers');\n    this.red._verify1(this);\n    return this.red.neg(this);\n  };\n  BN.prototype.redPow = function redPow(num) {\n    assert(this.red && !num.red, 'redPow(normalNum)');\n    this.red._verify1(this);\n    return this.red.pow(this, num);\n  };\n\n  // Prime numbers with efficient reduction\n  var primes = {\n    k256: null,\n    p224: null,\n    p192: null,\n    p25519: null\n  };\n\n  // Pseudo-Mersenne prime\n  function MPrime(name, p) {\n    // P = 2 ^ N - K\n    this.name = name;\n    this.p = new BN(p, 16);\n    this.n = this.p.bitLength();\n    this.k = new BN(1).iushln(this.n).isub(this.p);\n    this.tmp = this._tmp();\n  }\n  MPrime.prototype._tmp = function _tmp() {\n    var tmp = new BN(null);\n    tmp.words = new Array(Math.ceil(this.n / 13));\n    return tmp;\n  };\n  MPrime.prototype.ireduce = function ireduce(num) {\n    // Assumes that `num` is less than `P^2`\n    // num = HI * (2 ^ N - K) + HI * K + LO = HI * K + LO (mod P)\n    var r = num;\n    var rlen;\n    do {\n      this.split(r, this.tmp);\n      r = this.imulK(r);\n      r = r.iadd(this.tmp);\n      rlen = r.bitLength();\n    } while (rlen > this.n);\n    var cmp = rlen < this.n ? -1 : r.ucmp(this.p);\n    if (cmp === 0) {\n      r.words[0] = 0;\n      r.length = 1;\n    } else if (cmp > 0) {\n      r.isub(this.p);\n    } else {\n      if (r.strip !== undefined) {\n        // r is BN v4 instance\n        r.strip();\n      } else {\n        // r is BN v5 instance\n        r._strip();\n      }\n    }\n    return r;\n  };\n  MPrime.prototype.split = function split(input, out) {\n    input.iushrn(this.n, 0, out);\n  };\n  MPrime.prototype.imulK = function imulK(num) {\n    return num.imul(this.k);\n  };\n  function K256() {\n    MPrime.call(this, 'k256', 'ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff fffffffe fffffc2f');\n  }\n  inherits(K256, MPrime);\n  K256.prototype.split = function split(input, output) {\n    // 256 = 9 * 26 + 22\n    var mask = 0x3fffff;\n    var outLen = Math.min(input.length, 9);\n    for (var i = 0; i < outLen; i++) {\n      output.words[i] = input.words[i];\n    }\n    output.length = outLen;\n    if (input.length <= 9) {\n      input.words[0] = 0;\n      input.length = 1;\n      return;\n    }\n\n    // Shift by 9 limbs\n    var prev = input.words[9];\n    output.words[output.length++] = prev & mask;\n    for (i = 10; i < input.length; i++) {\n      var next = input.words[i] | 0;\n      input.words[i - 10] = (next & mask) << 4 | prev >>> 22;\n      prev = next;\n    }\n    prev >>>= 22;\n    input.words[i - 10] = prev;\n    if (prev === 0 && input.length > 10) {\n      input.length -= 10;\n    } else {\n      input.length -= 9;\n    }\n  };\n  K256.prototype.imulK = function imulK(num) {\n    // K = 0x1000003d1 = [ 0x40, 0x3d1 ]\n    num.words[num.length] = 0;\n    num.words[num.length + 1] = 0;\n    num.length += 2;\n\n    // bounded at: 0x40 * 0x3ffffff + 0x3d0 = 0x100000390\n    var lo = 0;\n    for (var i = 0; i < num.length; i++) {\n      var w = num.words[i] | 0;\n      lo += w * 0x3d1;\n      num.words[i] = lo & 0x3ffffff;\n      lo = w * 0x40 + (lo / 0x4000000 | 0);\n    }\n\n    // Fast length reduction\n    if (num.words[num.length - 1] === 0) {\n      num.length--;\n      if (num.words[num.length - 1] === 0) {\n        num.length--;\n      }\n    }\n    return num;\n  };\n  function P224() {\n    MPrime.call(this, 'p224', 'ffffffff ffffffff ffffffff ffffffff 00000000 00000000 00000001');\n  }\n  inherits(P224, MPrime);\n  function P192() {\n    MPrime.call(this, 'p192', 'ffffffff ffffffff ffffffff fffffffe ffffffff ffffffff');\n  }\n  inherits(P192, MPrime);\n  function P25519() {\n    // 2 ^ 255 - 19\n    MPrime.call(this, '25519', '7fffffffffffffff ffffffffffffffff ffffffffffffffff ffffffffffffffed');\n  }\n  inherits(P25519, MPrime);\n  P25519.prototype.imulK = function imulK(num) {\n    // K = 0x13\n    var carry = 0;\n    for (var i = 0; i < num.length; i++) {\n      var hi = (num.words[i] | 0) * 0x13 + carry;\n      var lo = hi & 0x3ffffff;\n      hi >>>= 26;\n      num.words[i] = lo;\n      carry = hi;\n    }\n    if (carry !== 0) {\n      num.words[num.length++] = carry;\n    }\n    return num;\n  };\n\n  // Exported mostly for testing purposes, use plain name instead\n  BN._prime = function prime(name) {\n    // Cached version of prime\n    if (primes[name]) return primes[name];\n    var prime;\n    if (name === 'k256') {\n      prime = new K256();\n    } else if (name === 'p224') {\n      prime = new P224();\n    } else if (name === 'p192') {\n      prime = new P192();\n    } else if (name === 'p25519') {\n      prime = new P25519();\n    } else {\n      throw new Error('Unknown prime ' + name);\n    }\n    primes[name] = prime;\n    return prime;\n  };\n\n  //\n  // Base reduction engine\n  //\n  function Red(m) {\n    if (typeof m === 'string') {\n      var prime = BN._prime(m);\n      this.m = prime.p;\n      this.prime = prime;\n    } else {\n      assert(m.gtn(1), 'modulus must be greater than 1');\n      this.m = m;\n      this.prime = null;\n    }\n  }\n  Red.prototype._verify1 = function _verify1(a) {\n    assert(a.negative === 0, 'red works only with positives');\n    assert(a.red, 'red works only with red numbers');\n  };\n  Red.prototype._verify2 = function _verify2(a, b) {\n    assert((a.negative | b.negative) === 0, 'red works only with positives');\n    assert(a.red && a.red === b.red, 'red works only with red numbers');\n  };\n  Red.prototype.imod = function imod(a) {\n    if (this.prime) return this.prime.ireduce(a)._forceRed(this);\n    return a.umod(this.m)._forceRed(this);\n  };\n  Red.prototype.neg = function neg(a) {\n    if (a.isZero()) {\n      return a.clone();\n    }\n    return this.m.sub(a)._forceRed(this);\n  };\n  Red.prototype.add = function add(a, b) {\n    this._verify2(a, b);\n    var res = a.add(b);\n    if (res.cmp(this.m) >= 0) {\n      res.isub(this.m);\n    }\n    return res._forceRed(this);\n  };\n  Red.prototype.iadd = function iadd(a, b) {\n    this._verify2(a, b);\n    var res = a.iadd(b);\n    if (res.cmp(this.m) >= 0) {\n      res.isub(this.m);\n    }\n    return res;\n  };\n  Red.prototype.sub = function sub(a, b) {\n    this._verify2(a, b);\n    var res = a.sub(b);\n    if (res.cmpn(0) < 0) {\n      res.iadd(this.m);\n    }\n    return res._forceRed(this);\n  };\n  Red.prototype.isub = function isub(a, b) {\n    this._verify2(a, b);\n    var res = a.isub(b);\n    if (res.cmpn(0) < 0) {\n      res.iadd(this.m);\n    }\n    return res;\n  };\n  Red.prototype.shl = function shl(a, num) {\n    this._verify1(a);\n    return this.imod(a.ushln(num));\n  };\n  Red.prototype.imul = function imul(a, b) {\n    this._verify2(a, b);\n    return this.imod(a.imul(b));\n  };\n  Red.prototype.mul = function mul(a, b) {\n    this._verify2(a, b);\n    return this.imod(a.mul(b));\n  };\n  Red.prototype.isqr = function isqr(a) {\n    return this.imul(a, a.clone());\n  };\n  Red.prototype.sqr = function sqr(a) {\n    return this.mul(a, a);\n  };\n  Red.prototype.sqrt = function sqrt(a) {\n    if (a.isZero()) return a.clone();\n    var mod3 = this.m.andln(3);\n    assert(mod3 % 2 === 1);\n\n    // Fast case\n    if (mod3 === 3) {\n      var pow = this.m.add(new BN(1)).iushrn(2);\n      return this.pow(a, pow);\n    }\n\n    // Tonelli-Shanks algorithm (Totally unoptimized and slow)\n    //\n    // Find Q and S, that Q * 2 ^ S = (P - 1)\n    var q = this.m.subn(1);\n    var s = 0;\n    while (!q.isZero() && q.andln(1) === 0) {\n      s++;\n      q.iushrn(1);\n    }\n    assert(!q.isZero());\n    var one = new BN(1).toRed(this);\n    var nOne = one.redNeg();\n\n    // Find quadratic non-residue\n    // NOTE: Max is such because of generalized Riemann hypothesis.\n    var lpow = this.m.subn(1).iushrn(1);\n    var z = this.m.bitLength();\n    z = new BN(2 * z * z).toRed(this);\n    while (this.pow(z, lpow).cmp(nOne) !== 0) {\n      z.redIAdd(nOne);\n    }\n    var c = this.pow(z, q);\n    var r = this.pow(a, q.addn(1).iushrn(1));\n    var t = this.pow(a, q);\n    var m = s;\n    while (t.cmp(one) !== 0) {\n      var tmp = t;\n      for (var i = 0; tmp.cmp(one) !== 0; i++) {\n        tmp = tmp.redSqr();\n      }\n      assert(i < m);\n      var b = this.pow(c, new BN(1).iushln(m - i - 1));\n      r = r.redMul(b);\n      c = b.redSqr();\n      t = t.redMul(c);\n      m = i;\n    }\n    return r;\n  };\n  Red.prototype.invm = function invm(a) {\n    var inv = a._invmp(this.m);\n    if (inv.negative !== 0) {\n      inv.negative = 0;\n      return this.imod(inv).redNeg();\n    } else {\n      return this.imod(inv);\n    }\n  };\n  Red.prototype.pow = function pow(a, num) {\n    if (num.isZero()) return new BN(1).toRed(this);\n    if (num.cmpn(1) === 0) return a.clone();\n    var windowSize = 4;\n    var wnd = new Array(1 << windowSize);\n    wnd[0] = new BN(1).toRed(this);\n    wnd[1] = a;\n    for (var i = 2; i < wnd.length; i++) {\n      wnd[i] = this.mul(wnd[i - 1], a);\n    }\n    var res = wnd[0];\n    var current = 0;\n    var currentLen = 0;\n    var start = num.bitLength() % 26;\n    if (start === 0) {\n      start = 26;\n    }\n    for (i = num.length - 1; i >= 0; i--) {\n      var word = num.words[i];\n      for (var j = start - 1; j >= 0; j--) {\n        var bit = word >> j & 1;\n        if (res !== wnd[0]) {\n          res = this.sqr(res);\n        }\n        if (bit === 0 && current === 0) {\n          currentLen = 0;\n          continue;\n        }\n        current <<= 1;\n        current |= bit;\n        currentLen++;\n        if (currentLen !== windowSize && (i !== 0 || j !== 0)) continue;\n        res = this.mul(res, wnd[current]);\n        currentLen = 0;\n        current = 0;\n      }\n      start = 26;\n    }\n    return res;\n  };\n  Red.prototype.convertTo = function convertTo(num) {\n    var r = num.umod(this.m);\n    return r === num ? r.clone() : r;\n  };\n  Red.prototype.convertFrom = function convertFrom(num) {\n    var res = num.clone();\n    res.red = null;\n    return res;\n  };\n\n  //\n  // Montgomery method engine\n  //\n\n  BN.mont = function mont(num) {\n    return new Mont(num);\n  };\n  function Mont(m) {\n    Red.call(this, m);\n    this.shift = this.m.bitLength();\n    if (this.shift % 26 !== 0) {\n      this.shift += 26 - this.shift % 26;\n    }\n    this.r = new BN(1).iushln(this.shift);\n    this.r2 = this.imod(this.r.sqr());\n    this.rinv = this.r._invmp(this.m);\n    this.minv = this.rinv.mul(this.r).isubn(1).div(this.m);\n    this.minv = this.minv.umod(this.r);\n    this.minv = this.r.sub(this.minv);\n  }\n  inherits(Mont, Red);\n  Mont.prototype.convertTo = function convertTo(num) {\n    return this.imod(num.ushln(this.shift));\n  };\n  Mont.prototype.convertFrom = function convertFrom(num) {\n    var r = this.imod(num.mul(this.rinv));\n    r.red = null;\n    return r;\n  };\n  Mont.prototype.imul = function imul(a, b) {\n    if (a.isZero() || b.isZero()) {\n      a.words[0] = 0;\n      a.length = 1;\n      return a;\n    }\n    var t = a.imul(b);\n    var c = t.maskn(this.shift).mul(this.minv).imaskn(this.shift).mul(this.m);\n    var u = t.isub(c).iushrn(this.shift);\n    var res = u;\n    if (u.cmp(this.m) >= 0) {\n      res = u.isub(this.m);\n    } else if (u.cmpn(0) < 0) {\n      res = u.iadd(this.m);\n    }\n    return res._forceRed(this);\n  };\n  Mont.prototype.mul = function mul(a, b) {\n    if (a.isZero() || b.isZero()) return new BN(0)._forceRed(this);\n    var t = a.mul(b);\n    var c = t.maskn(this.shift).mul(this.minv).imaskn(this.shift).mul(this.m);\n    var u = t.isub(c).iushrn(this.shift);\n    var res = u;\n    if (u.cmp(this.m) >= 0) {\n      res = u.isub(this.m);\n    } else if (u.cmpn(0) < 0) {\n      res = u.iadd(this.m);\n    }\n    return res._forceRed(this);\n  };\n  Mont.prototype.invm = function invm(a) {\n    // (AR)^-1 * R^2 = (A^-1 * R^-1) * R^2 = A^-1 * R\n    var res = this.imod(a._invmp(this.m).mul(this.r2));\n    return res._forceRed(this);\n  };\n})(typeof module === 'undefined' || module, this);"],"sourceRoot":""}